There needed to be no people around during the time they went after her and the surveillance in that area needed to be nonexistent, have blind spots that could be exploited or it would be known to not be functional.
If it came to it then he could get someone to damage or spray paint over the cameras in an area in preparation for the attack.
He had numerous ways to make it so that they could take their time causing her both mental and physical harm without being disturbed or caught for when they planned to do.
It was definitely not the first time he had done such a thing and he had gotten away with it several times already.
The only reason why he believed that it failed was due to everything being done without any preparation and planning.
