There's no betrayal here, just someone rushed and, apparently, was mistaken in their confidence. But I dare to hope that over the years, we've built up enough trust to understand that one player won't intentionally ruin another's game. Out of stupidity, haste, or role-playing considerations, it's quite possible, but such a mistake isn't worth even a little resentment. After all, it's a game, not a guaranteed win – you can lose here, and it can even be someone else's fault. Bad things happen in life, and there are no take-backs.
e si ieu muoir, er mi grans deliuriers