diff --git a/.efrocachemap b/.efrocachemap
index 74d83a3e..057ab683 100644
--- a/.efrocachemap
+++ b/.efrocachemap
@@ -4135,16 +4135,16 @@
   "assets/build/windows/x64/vc_redist.x64.exe": "https://files.ballistica.net/cache/ba1/ea/19/8b8787d81abcdce158ba608cd24f",
   "assets/build/windows/x64/vcruntime140_1d.dll": "https://files.ballistica.net/cache/ba1/11/d8/ff6344b429b00c24d9a1930d4338",
   "assets/build/windows/x64/vcruntime140d.dll": "https://files.ballistica.net/cache/ba1/20/33/0825e11e6518f87ece3009309933",
-  "build/prefab/linux-server/debug/dist/ballisticacore_headless": "https://files.ballistica.net/cache/ba1/05/0d/bc658d9bcf94d07bde0812c3f4a7",
-  "build/prefab/linux-server/release/dist/ballisticacore_headless": "https://files.ballistica.net/cache/ba1/2f/ce/d2018415a449ad310a68970ac848",
-  "build/prefab/linux/debug/ballisticacore": "https://files.ballistica.net/cache/ba1/4e/60/bbf2bf14e58835ea71897366674c",
-  "build/prefab/linux/release/ballisticacore": "https://files.ballistica.net/cache/ba1/7b/7b/5c7d8989c1cf1a34c3b84390d26d",
-  "build/prefab/mac-server/debug/dist/ballisticacore_headless": "https://files.ballistica.net/cache/ba1/d2/33/f26482f85d7e3fe349badc83fb38",
-  "build/prefab/mac-server/release/dist/ballisticacore_headless": "https://files.ballistica.net/cache/ba1/24/30/0a93d6fb06eaf30e698900f7719f",
-  "build/prefab/mac/debug/ballisticacore": "https://files.ballistica.net/cache/ba1/c9/7f/d3d4952829448c53ad93c4a7a7f6",
-  "build/prefab/mac/release/ballisticacore": "https://files.ballistica.net/cache/ba1/64/40/0e1838ce963ebc0ff5927d2ef096",
-  "build/prefab/windows-server/debug/dist/ballisticacore_headless.exe": "https://files.ballistica.net/cache/ba1/3b/3b/13e222119a4fae02a43ebca3a2e1",
-  "build/prefab/windows-server/release/dist/ballisticacore_headless.exe": "https://files.ballistica.net/cache/ba1/5b/90/2f7e0be10cf2e4681902b1dbfac5",
-  "build/prefab/windows/debug/BallisticaCore.exe": "https://files.ballistica.net/cache/ba1/8e/76/6b1a723d85bc9fd81ca44f71c653",
-  "build/prefab/windows/release/BallisticaCore.exe": "https://files.ballistica.net/cache/ba1/11/cd/8152982a3b7f9970cde209470f9c"
+  "build/prefab/linux-server/debug/dist/ballisticacore_headless": "https://files.ballistica.net/cache/ba1/4e/53/7ec6327e532452541ad97ff927ab",
+  "build/prefab/linux-server/release/dist/ballisticacore_headless": "https://files.ballistica.net/cache/ba1/70/7f/d853bede37c4b91d822cf853fc51",
+  "build/prefab/linux/debug/ballisticacore": "https://files.ballistica.net/cache/ba1/9f/be/93c11fb8a237efcec5fe9e95b52f",
+  "build/prefab/linux/release/ballisticacore": "https://files.ballistica.net/cache/ba1/a2/4a/cd3f8408329ac476450b14d961a4",
+  "build/prefab/mac-server/debug/dist/ballisticacore_headless": "https://files.ballistica.net/cache/ba1/0f/6e/fb1fffbb11902f90edd5ea3ff257",
+  "build/prefab/mac-server/release/dist/ballisticacore_headless": "https://files.ballistica.net/cache/ba1/f0/f7/9cb910b949bab6ac8b4c82f8b03d",
+  "build/prefab/mac/debug/ballisticacore": "https://files.ballistica.net/cache/ba1/f2/1e/483962e078392dafe3c47ab56ec8",
+  "build/prefab/mac/release/ballisticacore": "https://files.ballistica.net/cache/ba1/ca/70/1c30ceee55f2a89657507b7023d7",
+  "build/prefab/windows-server/debug/dist/ballisticacore_headless.exe": "https://files.ballistica.net/cache/ba1/56/89/69526aeb40798e71afe19984b68f",
+  "build/prefab/windows-server/release/dist/ballisticacore_headless.exe": "https://files.ballistica.net/cache/ba1/93/d1/23e82bfbdfb38bf3e443939490be",
+  "build/prefab/windows/debug/BallisticaCore.exe": "https://files.ballistica.net/cache/ba1/e5/a2/96201ceeefb90d6ebb4b81089b67",
+  "build/prefab/windows/release/BallisticaCore.exe": "https://files.ballistica.net/cache/ba1/55/42/cfd614f84ade2658ba12dff258b6"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 27c2b7a5..18789952 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+### 1.5.19 (20114)
+- Cleaned up some bomb chain-reaction logic to avoid weird corner-cases such as land-mine explosions behaving like punches when set off by a punch. Holler if anything explosion-related looks broken.
+
 ### 1.5.18 (20108)
 - A bit of project cleanup; tools/snippets is now tools/pcommand, etc.
 - More minor bug fixes and crash/bug-logging improvements.
diff --git a/assets/src/ba_data/python/_ba.py b/assets/src/ba_data/python/_ba.py
index c5078118..1a03a0e9 100644
--- a/assets/src/ba_data/python/_ba.py
+++ b/assets/src/ba_data/python/_ba.py
@@ -613,6 +613,7 @@ class Node:
     model_opaque: Optional[ba.Model] = None
     model_transparent: Optional[ba.Model] = None
     damage_smoothed: float = 0.0
+    gravity_scale: float = 1.0
     punch_power: float = 0.0
     punch_momentum_linear: Sequence[float] = (0.0, 0.0, 0.0)
     punch_momentum_angular: float = 0.0
diff --git a/tools/batools/pcommand.py b/tools/batools/pcommand.py
index 177a43d4..7e904c7e 100644
--- a/tools/batools/pcommand.py
+++ b/tools/batools/pcommand.py
@@ -674,10 +674,11 @@ def efro_gradle() -> None:
         enabled_tags = {'google', 'crashlytics'}
 
     buildfilename = 'BallisticaCore/build.gradle'
-    # Backup the original file, preserving timestamps and whatnot so as to not
-    # trip modification tests.
-    subprocess.run(['cp', '-p', buildfilename, f'{buildfilename}.prev'],
-                   check=True)
+
+    # Move the original file out of the way and operate on a copy of it.
+    subprocess.run(['mv', buildfilename, f'{buildfilename}.prev'], check=True)
+    subprocess.run(['cp', f'{buildfilename}.prev', buildfilename], check=True)
+
     filter_gradle_file(buildfilename, enabled_tags)
 
     try: