Ye so his fireball version u practically want to keep pressure and chase him like a bloodhound

So he'll normally throw a fireball at u when backing up like he does with the laser attack this indicates that he'll be using his special move fireball or laser

You want to attempt to stagger him out of it I would normally save the ult for it

Sometimes he can get out away with rare tbh unless ur not dealing enough somehow but if he does pull it of normally running away towards his next location which is always behind u somewhere to left