Duo took the needles, frowning and swallowing hard. He really didn't want to do this. He hated hurting people that didn't deserve it, but having to do it to some one to save them...

It still made his stomach turn, even trying to justify it like that.

"This... this is gonna hurt... a lot. And I'm really sorry." he said slowly, prepping the needle and sitting down behind Toph, taking in a shaking breath before starting.