Absolutely a good point. It would be difficult and cumbersome at best to draw and get a finger in a trigger guard.
He switched from concealed earlier in the frame to a low hanging open appendix carry as he approached, thus brandishing the gun and removing all doubt to anyone watching what his intentions were. That is strange. Even hitman and pros or common burglars would not let the person behind the door --or if someone came upon him outside by chance-- their nefarious intention. You see a guy with a mask, gloves, brandishing you immediately react defensively. So it seems mainly for intimidation.
The whole get up seems thrown together to me. Reflective stripes on a backack, really? Mismatched holster. Bulky nitrile chemical proof style gloves? Pros dress a certain way for a reason. "High speed, low drag." All black is a cliche for a reason.