If any part of the chargers hitbox touches yours while he charges, it will grab you. Even if it's the tip of your feet hitbox, you will die. So don't trust the heights, always back up and jump
If you see a downed player make sure you open boxes first before reviving. Open next to them of course
If you see a player with 1 hp looking around for some pills you pull out your own pills get his attention first and swallow it infront of them.