Heres what I`d do
...
Randomly put a Countdown timer above the Bedroom door...
They`ll all say "Wtf..."
And Marcus will probley think if the 40 minute countdown timer gets to 0 then the house will blow up
Then (If Marcus dosent smash it) the Timer will get to 0
After that, it means the Nomination Rules are back to Normal, only a really smart HM will accually know what the timer ment.
The first 2 or 3 HMs to discuss Nominations (thinking its allowed) will immediatly face Eviction!