Gee, almost any shmoe who could visit a butcher shop and buy a disposable camera could do that.
As to the “other gang” — they had to know that, until the ruse was exposed, that added the other gang to the HA’s target list. Unless a truce is bargained, it’s like Hatfield and McCoy. If something had happened as a result, I wonder how the pair would have felt ethically about that.