Tiger didn't want to make his appearance know yet since he didn't want the hostages being killed.  So, the man hopped from roof to roof until he got a vantage point on one of the buildings.  He looked at the cop surrounded bank and tried to think of the best way to get in.  As he looked, he spotted movement from the corner of his eye and recognized the figures.  He hopped over to their roof and said, "Hope you don't mind me tagging along.  It's Doll."