This isn’t the first time I’ve seen this, it’s come up a few times but I thought the team had fixed it. This topic mentions enemy.defeat():
[BUG] multiplayer hack? Starting with zero health
Where bryukh said:
“Thanks, guys! I’ve fixed it (maybe need some time for caching refreshing). We know where from this cheat appeared but not sure how long it has been working.”
That was a long time ago though…
Danny