Coop compatibility question

[kuchitsu]

Let's say my friend finds the red key, opens the red door, we go through it together. The door behind us closes, and soon my friend dies (and this is survival, a no respawn mode... or maybe he just disconnects). Now I'm trapped because I need to go back to the start at some point but I don't have the red key. Is it a coop bug that needs to be addressed or just my fault?

[scifista42]

I'd say it is a bug, simply because it prevents the game from ever being finished, assuming it really does so.

[kuchitsu]

Hmm. Does this ever happen in iwads? It seems that usually there is some way back even without the key, or the door just stays open.