I hate when the rules are all over the place. Owens hits someone with the list and it's a DQ. Dean Ambrose comes out to the point a dozen security men have to hold him out and the ref just shrugs it off. Strowman gets counted out, the Shield spend like a minute or two outside during that whole powerbomb sequence and the ref doesn't bother once.
Owens was a participant in the match. So he got DQed. Ambrose was already eliminated, so what do they do? Eliminate the guy from the other team currently in the ring? There's precedent for this with the Team Austin vs. Team Bischoff match. Jericho got eliminated and immediately attacked HBK with a weapon, and there's nothing the ref could do.