In 66 they knew it was one guy. These poor guys on the 32nd floor didn’t know if there were one or ten in that room. No need to rush the room if the guy quit shooting. They did the right thing. Wait for SWAT. IMHO. The guy quit shooting after about ten minutes.
A SWAT team would have to approach the situation like any military breach with very little useful information, having to assume it’s a large well armed group with hostages,an environment of stairwells and other choke points with plenty of space for booby traps. This was a learning experience for American law enforcement AND our enemies foreign and domestic.