For the duration of the fight, they sit on a swing. They have two known attacks:

Pip opens his hat to summon a Domino Bird, which has eyes on each side of its face, that travels along the screen to the player's current location. The bird acts as an obstacle to hurt the player(s), but can be defeated. Hitpoints = 20/20
The second attack involves them spitting a blue, pink or orange twenty-sided die from a sharp-toothed mouth in-between them which slowly travels in a zigzag motion in an attempt t