How are stolen sneakers, even if he stole them ten minutes before relevant to the case in question of trespassing on a home being constructed?
It’s not.
The best thing those two could have done is inform Avery the cops were called and they were going to observe. Avery would have ran for his life at that point and their dealings with him would have been done.
Except that they didn’t call the cops until THEY SHOT HIM.