Code:
on damage:
if player's group = "security-base" or "security-rtu" or "security-dir"
cancel event
else:
if player's group = "chaos-base" or "chaos-assassin" or "chaos-trialblazer" or "chaos-commander"
uncancel event
on damage:
if player's group = "chaos-base" or "chaos-assassin" or "chaos-trialblazer" or "chaos-commander"
uncancel event
else:
if player's group = "security-base" or "security-rtu" or "security-dir"
uncancel event