Honestly, I had no problems with anything Urbik or Pears did during their time in the game. The poor play seemed to come from the 3 that many have the most faith in (Bell, Levitre, & Wood). Wood got blown up on multiple occasions.
Can't say for certain because we obviously don't know how their protections work or what type of protection was called, but since the DE went outside of Chandler and he was staying as a pass protector it would typically be his man 1-on-1. Pears has a responsibility to his area and has to make sure there is nothing coming late to his gap (stunt/blitz). If nothing shows he can try to help, like he did, but Chandler getting burned screwed that play.
Also, after rewatching the play, on the play action Bailey was fooled and takes two steps towards the line of scrimmage post snap in what appears to be a blitz look before retreating into coverage. Pears had to stay home to cover for that blitz that did not come.