Let me simplify this.
It's like in Checkers/Draughts, when you only have one white piece left, and you have no choice but to let the dark piece jump diagonal onto you!
Still not getting it?
It's like when you roll in Snakes and Ladders, and after counting the squares on your hand, you realize you have no choice but to advance to a snake and slide down, so you throw a tantrum.