His solitude had driven him to become all the more bitter and snide than before, if such a thing is even imaginable. He usually was a trouble-maker but because of the horrible weather and his horrible personality it showed all the more.

"Bushed?!" he let off a high-pitched cackle and grinned "I'm a whole garden, a forest! Ahaha! Bushed?! Get off me, witch!" he sneered at Ashe and went to shrug off her grip. "She was 'cool' when I met her, but I think I'd like her better dead."

Obviously his time alone had messed him up even more, but the thing is, Ashe probably knew that with the right sort of persuasion Isaac could be totally harmless. So all of his threats and insults didn't really mean all that much.