If all of the players throw their chainsaws before the 3 kill weapon swap is hit, no one will have a weapon and, therefor, will not be able to progress until another player joins or someone relogs. This can happen also with the axes, but the players would need to throw it in a way where it is unobtainable, which can happen with physics objects
There probably should be some way to prevent everyone in the match from losing their weapons like this, but it’s also worth mentioning that, for now, every map has some kind of environmental hazard (in Frostbite specifically, falling into the aquifer/pond in the basement is instant death), so you can at least die and get your weapon back.