PG 29: Calculate Strength: c. Both players now add up the cumulative strength cost of all cards in their combat stack. If this total exceeds the combatant’s strength, that combatant immediately becomes exhausted and his card is canceled.
How does this interact with cards like 'Quick Shot' or 'Block' which state 'This card cannot be cancelled'? Does the cancel caused by exhaustion overrule the fact that the card cannot be cancelled, or is this a case of the combatant using the very last reserves of their strength to defend/attack. Since they are NOW exhausted, they would not be able to play any more cards, I'm inclined to think that the card takes precedence and that even though they have exceeded their strength, the card is not cancelled.