Charlie's Death in S03e22 IS SO STUPID
The scene in case you want to see it:
https://www.youtube.com/watch?v=5IW1n_-UP88
So he ALREADY had the information that it wasn't Penny's boat, so there was no reason for him to close the hatch with him inside. And to make maters worse, the guy that was holding the grenade outside (Mikhail?) is shown, after the hatch is closed, only exploding the grenade seconds AFTER the hatch was closed.
Am I missing something?