What do I do? Really stuck, please help!

[BarnwoodCoop]

https://imgur.com/a/WGUGMtm

Is this normal? I’ve attached two videos. The one rolling around and clicking his beak and kicking his legs is the new one. I’ve put them both back together and it keeps trying to nudge under the OG chick? And the OG chick hates it. Is it sick?

little hard to tell but to me that looks just like dustbathing behavior, nothing too serious, they do it instinctually. dunno about the nuzzling under though, never had a chick do it