Some combination of: Trying to make sure the 'squeeze play' didn't go awry. Being told twice the helicopter could see the CRJ and would maintain visual separa

Some combination of: Trying to make sure the 'squeeze play' didn't go awry. Being told twice the helicopter could see the CRJ and would maintain visual separation. The built-in vertical separation rules. A jet in landing configuration isn't in a great position to see and avoid something below it.