I found this on YouTube. It is the only working one which I could find for SAMP 0.3.7. It is not perfect yet, sometimes it won't damage the player at all while sometimes it is so effective that a player will die in a second.
Credits:
Activation/Deactivation:
Requirements:
Credits:
Niko
F9
SAMPFUNCS 5.2.1
CLEO 4.1
CLEO 4.1