When he grabs you while standing up and holds you (close to his face), just struggle down like 4 or something times (the animation of you struggling needs to finish) and let the yellow bar run out and it should trigger
Haven't tried yet didn't get around to it today but will once I get up in the morning and have time thanks again. The game is maybe abit short but not bad sadly had to slow the game down when fighting the large boss type enemies like the pig lady i thing in the city but aside that a cute fun sandbox