Sorry for any confusion this may have caused!
Who'd be the one to sacrifice themselves so the survivors and killers could escape?
Imo, Bill would be the one to sacrifice himself to ensure that the survivors and killers would escape the nightmare that is the entity's realm.
Theoretically, Bill's perks are mostly the ones revolved around his teammates and an undying will to not give up.
Also if you've ever played the L4D games then you'd know that Bill sacrificed himself so Zoey, Francis and Louis could escape the horde of zombies.
So in my opinion this solidifies that Bill would probably be the one to sacrifice himself so the others could escape.