Were you able to see any muzzle flashes?
Not really. The videos were shaky and short. One conspiracy video (10 minutes) was a compilation without time-stamps and the compiler's contention that shots came from about the 4th floor. The video he/she used was only about 6 seconds and was in motion filming right to left. The 'flashes' the compiler pointed out were not convincing -- they could have been a strobe or reflection.
But, there were no missing/broken/cracked windows in that area when daylight came.
Someone posted above [in this thread] that the broken windows (32nd floor) were actually on the opposite side of the building. I have no way to confirm or deny, but that should be sourced, if true.