Everyone in Mob Psycho can do psychic energy binds that cover one's entire body (
Example of Mob twisting all of Toichiro's body at once,
even down to his eyes in the anime). The only reason people in Mob Psycho can talk is because, once again,
they have higher lifting strength/psychic resistance that allows them to resist psychic powers to an extent. Like Tochiro in that scene having Class T as well, allowing him to still talk, though even he was struggling to do that.
Zagred has neither psychic resistance, nor high enough LS to resist a bind at all, so please stop saying this. It's just what would logically happen if he put the guy in a
Class T psychic bind, and it would cover all of the mouths.
Again, because this is really obvious stuff here, he can have him under a full-body pressure that is
47,598,623x stronger than what he can resist.