{So, it was a timer. Chrome was liking this room less as time ticked onward or backward. No. It wasn't a clock, stop thinking of it as a clock. It's a trap.}

Do what...oh

{Now, all that was left to prove it true. She kept an eye on the timer, daring it to change; then leaned in closer to Mukuro's side. Sure enough, the digits swapped back to 7}

...well that's not very fair.