In the Rule “Nomich”, after the text

Any member of a Dormitory whose Condition is Alive may post a play on behalf of their Dormitory, and the first play posted by a Dormitory in a challenge thread is the one that is scored for that match.

Add the text:

If a Dormitory does not post a play on a Challenge, they are assumed to have declined (i.e. not accepted) the challenge if it is be legal to do so, or played a sequence containing no cards otherwise.  When a Challenge is declined in this manner it ceases to be a Challenge.  If a Once a legal play has been made by both Dormitories, all cards in those plays are removed from the hands of the Dormitories involved.