on coop, is this a bug?

[Cucumbertronic]

Hi,
We're early on in the game.
There's a wall & door we can't get past.
http://steamcommunity.com/sharedfiles/filedetails/?id=1316143323

[Cucumbertronic]

IS it because I killed the chickens up top?

[rat balls]

Just buyed the game for my friend, gonna tell you if we can

[Cucumbertronic]

cheers