Because it is wrong. Because the last time I checked, it upset you to do so.

[Now there's a thought, while he ponders where this explosion came from. What would have happened if it had occurred when Maedhros was with the street children he had grown so fond of?]

And because you promised to mind your behavior while we remained here, if I remember correctly. Will you break your word now?

[An angry toss of the head] I know nothing of the sort. Stay there, I am coming down to see you.

[Unarmed, because there's going to be enough pointy objects around as it is.]