If we don't know the clock, then we can't be complacent about time we do or do not have
Aranwen will put forth the suggestion that she, Ch'dau, and Garn push out so that the three of them are in the room beyond the hall proper, just past the door
Provided the zombies fall easily enough, that lets them potentially clear 3 at a time as opposed to 1. Gib and/or Cedric in the hallway can then support all three.
Certainly a lot riskier, with up to three zombies potentially threatening a single melee fighter, but to clear this group faster may be worth the risk,