Rinzler can't quite work up the energy for real anger, but he still bristles visibly, mask tipping up to glare. This user isn't stupid enough to expect him to know the other's feelings. No, this question is about what Rinzler did. How he 'made' it attack.

Glitched.

Not his fault. The glare shifts to the other side of his cell as he types out the rest.

Discovered user (ID: Cannae_Spearfall) taking personal possessions.
Confronted user.
User attacked.

That's all. It was malware, and it was stupid, and even if he didn't have the right, he's still glad that it's gone.