Spymaster
Plastic Paddy
Clearly out; the catch was completed before the contact with DBD.
That doesn’t matter though. If the fielder completes a catch and steps over the rope it’s a 6, isn’t it. The question is whether 2 fielders in contact is the same as one. I don’t reckon there’s a law for it but sensibly, I think it should be out. The catcher’s done the job and not gone over.