He wasn't able to even see the shadow of the guy that took his life, but that was to be expected for someone like him who was trying to kill someone else.
A killer had to take into consideration his own death before he went to kill someone else, this was simple logic.
The moment that the truck had hit the building a big cloud of smoke, debris, and dirt covered the whole area, so it was impossible for normal people to see anything in there.
Even the snipers that were lying in wait around the place weren't able to see what was going on in there, and by the time that the scene was cleared, there was no one standing there.
They were about to think that he never got out of the taxi, but the corpse of the truck driver clearly stated otherwise.
Not only had he gotten out of the taxi, but he had also managed to kill the truck driver, and then escape without a trace. This was completely out of their expectations.