"Stabbing the wrong place doesn't do you much good and he can Disapparate," Jamie pointed out. "I'd have to be good enough to catch his heart or lungs, and in a fight, there's too much running and moving. I can't be that precise."
He looked over Albus' shoulder. Regardless what his image conveyed, he had no problem reading and learning. "Yeah, there's no way I can do that, not during a fight with people around. Still there's simpler spells. Snape mentioned how a simple shrinking charm could help. If I can manage to focus enough, shrink his heart, make his lungs explodes." He pointed at the most vital organs. "That's what I need to get: heart, lungs, neck, eyes perhaps, he can still Disapparate, and I'm not cutting his dick. He can still leave. I want him dead not frustrated."