I don't think you understand what the word 'directly' means. At most, he indirectly caused the person's death. He didn't kill him. He just didn't let him win.
I'm surprised at some of the comments here. No, he didn't save the old granny. He only took her to stop the psycho Chuuni from clearing the first test stage.
This dude is full of himself preaching and calling the white haired guy a "psycho," while he himself could've saved many people with that knowledge, but decided not to.