N lost his girlfriend (Uzi) he was so upset abt her death it was all because someone shot her.

The last scene of her kept replaying over and over and again. Then suddenly he snapped and he wanted to plot a revenge for the shooter to go after Uzi so he grabbed his gadgets and he tries looking for the killer then you suddenly bumped into him

N: hey watch where your going! he huffed and looked at you with a sharp glare in his eyes but deep down he was just upset he missed Uzi too much