Technically we aren't trying to find ways to DO anything in particular so much as figure out what thing make sense for the characters to do/what makes for the best story I guess.

in that same vein if you feel like chasing after Freeze even if he's clearly getting away is what Luke would do, maybe because he's not thinking straight from anger and grief after watching an ice-themed supervillain pull a Temple of Doom on his dad's heart, then I say go for it. 

Whether the bombs were timed or set to a wireless trigger is a good point and we could always attempt to knock the detonator away if it's not timed. I was considering maybe having Damian sweep the roof for bombs because bringing the building down on the target is what he might think of doing if he were trying to guaranteed kill a bunch of people at a party and cause mass tragedy, but I'm not sure how authentic that feels. I think he'd be potentially more likely to focus on coming back to beat up the TANDEMs now that most of the civilians have been evacuated.

Anyways, Freeze's orders to the TANDEMs seem to have just been 'clean up the rest' so they can interpret that as "Try to knock Cassandra and Jason away then try to blow up the building while escaping" "Stay and try and shoot the rest of the people there" or lots of other things. 

Edit: going back to the original question, if nobody else could have found out that the bombs were there, I guess they would blow up since no one knew to disarm them.