Amos can communicate with the mute as well as anyone. He can't communicate mute, but most people can't. Anyway, it's all about facial expressions.

Amos is already in his suit as well, helmet sitting on an unused workbench. He has a tranq syringe in hand, but before that, he register's Gideon's expression.

His voice isn't gentle, but neither is it harsh. "Hey, Teach. I won't let anything bad happen to you."