if you just started playing, or if he's never done anything like this before, fold. i'm probably folding anyway, because heads up i find you're either better than them or you're not, there's no need to risk your stack on a slight edge if he has overs, and being way behind if he doesn't. -EV long term IMO, he only needs to have higher pockets ~5-10% of the time to make this -EV for you, which he will. only way i'm calling is if he has been pushing a lot and i'm getting bullied.