"No way. This is a big no-no. I can not allow anyone to do this foolish thing as long as I am here" Liam seemed to put his foot down. He felt like the only responsible person in this group so he had to be their voice of reason as well. He did not want them to get themselves killed or worse, to be arrested and put his reputation at stake.
But the other two seemed to have made their mind already and Mark felt obligated to keep an eye on them. Otherwise, there was going to be chaos they could not afford and Liam understood that fear as well. That was the only reason he did not stop Mark.
As much sense as Liam made, he was overruled one to three in the end. Mark could not help but feel a little sorry for the tired man. He who early deserved better than this. But since he was an opponent right now, Mark chose to keep his silence.