Jeff was surprised how quickly that left hook of his was and couldn't do anything but preposition himself to go into a roll to minimize the damage of the punch that hit him in the face. Thankfully at least it was before he turned into this blue giant smurf that would have made his head a pancake otherwise. Still it left him bleeding in his mouth and coughing up a bit of blood. "Gah, and you hit hard for a puny mage... I guess I can say it was beyond what I expected as well.." 

Jeff took a moment to stand up and shake off the hit before readying for whatever Sera planned to do next here. At this point, the bomb's effects wore off and arcane power was restored to him and Sera. Given it didn't seem he would be relying on it too much right now.