Is it ok for the second player to internationally bubble to avoid death or do all players have to stay out of the bubble unless they die and if that is the case, how long may they stay in the bubble?

When i said international I meant Intentionally

The rule is that there have to be two players or more at all times, but any player can be in a bubble for as long as they want.

Yeah no rule mention the time limit a player can stay on a bubble. You must be a least two players or more in the run.

Also, for verification purposes I suggest you to record your voices or something to proof you are a least two peoples (if you include a video on your submission, sure)

Ok thanks, that helps a ton :)