BUG at Tim/Tom/Tum mission "To Arms"

[Maahtz]

So i was trying to do the Tim Tom and Tum mission in "To Arms"

I chose idontevenknowanymore Tim. then i shot Tum. then i proceeded to kill tom, but the "choose one" E-Option was avaiable. I though that was a feature and pressed E. Then Tim started shooting me too. Both were shooting me and both were invincible Zombies with 0 life points left. Could'nt finish the mission. I tried loading the area again, but since Tum was already dead, there were only 2 persons. I chose one of them, killed the other on "kill the other two" is still not finished.

What can i do to finish that mission anyway? Anyone else has seen this bug? Ill try to solve it through multiplayer though and come back then.

[Darknorwood]

Having the same bug, not sure what to do yet