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The explosions of two grenades brought the two advancing SWAT teams to a halt; they seemed unprepared for an all-out assault, at least they weren't mentally ready for it.
It's easy to understand when you think about it. The negotiators had already been deployed, and the mission had shifted to a hostage rescue operation. Whether it was the standard police or the SWAT, defensive preparations were definitely in place.
Taking advantage of the time the negotiators were discussing terms, everything that needed to be arranged was set up; snipers were positioned, and based on the negotiators' observations, they chose possible routes of attack and how to select equipment, among other things. In short, if an assault was needed, it wouldn't be launched blindly.