It will be very interesting. I actually would not be surprised to see it go the other way, with the C's making a concerted effort to stay under control. I think the C's did that for much of the playoffs, particularly against the Cavs, but have regressed a bit in this series. But I expect them to be all business on Friday night...although I am sure they will be physical.
The other thing I expect is an incredibly tense crowd. I can't remember which game it was, but in 2008 I remember one playoff game (I think it was against Detroit, but not positive) where the Garden was just oozing nervous tension. It was actually incredibly quiet for a playoff game, yet you could feel the energy in the building, waiting to be released by a C's win. I expect that to be the case on Friday as well. I don't think the place is going to be especially loud and crazy with drunks partying in the aisles. I expect it to be eerily quiet, with a sense of tension flowing through everyone. Yet not completely in a bad way.