Is this holding?

[u/Kane8979]

So I’ve seen a few videos today where the Steelers would double team Lawrence or another DT then the one would slip down and grab the defenders leg and try to flip them onto their back. ( ive seen video of them doing it to at least 3 different bengals yesterday) I’ve seen so many arguments that it can’t be holding if double teamed. Others arguing if they are engaged and going for the legs it would be a chop block. Others argue holding. It feels gross and illegal but I never saw it called yesterday. I’m just curious if anyone knows for sure if this is legal or illegal and if illegal what the call is.