Ducks’ Frank Vatrano, left, reacts to scoring his third goal against Philadelphia Flyers’ Samuel Ersson, right, during the third period Saturday in Philadelphia. Frank Vatrano recorded his fifth career hat trick and Adam Henrique, Ryan Strome, Trevor Zegras and Brett Leason added a goal apiece as the Ducks beat the Philadelphia Flyers 7-4 on Saturday. We’ve fallen behind in a …