By her soul's tilt she is being honest. Glosialabolas thinks the equivalent of "The HECK?" in Infernal.
He amends another term or two and hands back the compact again. "Tell the mortal that Glosialabolas, who made this compact, guaranteed this: The deed that results from this contract's signing and its execution, will be as I expect that he will expect. As for the consequences of the deed itself, time will show it."