Nobody touches his collar. He saw what had happened when Jason took Roxas' collar off. The boy had died, anyone and everyone in the tower could see it when it had happened. It hadn't been locked. In response to Thranduil's tone, so unfamiliar when turned towards him, and his reach towards the collar, Legolas leans back and away from the touch.

"It keeps my soul in my body. I will die without it."

How easy it is to believe after a year there. After witnessing various terrors. What he wouldn't give to see home again, home as it should be.