The links don’t open for me, sorry. I’ve seen the first video judging by the thumbnail; it shows a cop waving to someone offscreen. Other cops maybe? Given that we have plenty of video of police being attacked I’ll need stronger evidence for the “cops waved them through” theory.

Occam's Razor suggests that the cop was gesturing to other cops on the line that they were retreating from their position and falling back. To suggest otherwise strains credulity and would require much more substantial proof.

That sounds plausible. Police do not calmly wave rioters through in one area while their colleagues are getting beat up elsewhere. Once us vs. them mentality settles in it’s game over.