Flesh is quite good at conducting localized heat away, thus why people can microwave their hand to no ill effect.
But, if that laser has any UV component to it he might already have triggered skin cancer.
who the hell microwaves their hand? also a microwave (assuming you mean an oven) wouldn't be applying heat to an object, but radiation to excite the molecules to generate heat. you might not burn your hand like you would in an oven, but you would start to boil the water in your blood and probably risk cancer.