You can very slowly crawl in "bleed out" state (10% of crouching speed)

5% of crouching speed while swapping weapons
2,5% - reloading / shooting (auto-fire) 
0% - ADS / throwing / using melee(mod)

Messiah fix (host only) - No game over until every player goes into an "Incapacitated" state (delete playerbleedout.lua to make it standalone)