Hm... a tricky ask. I'm not used to dealing with deities from other dimensions. Without a way to properly portal back to his home plane, I doubt I can let you punch it, unfortunately. I only have the ability to remove things via the mirror, not shove someone else's fists into said mirror and let them punch a god.

You must understand, if I could do this, I'd already be punching. [Yeah.] I think I can make you a device that'll shut the connection down at his will. Something wearable — a choker, bracelet, necklace, pick your poison. But I'll need you to do something to fuel this magic, if you don't mind.