"Straining Move" cards cannot be stopped or prevented.
He's right though... You really don't have all day...More like five minutes.
Errata:
Treat this card as if it read, “Once per Combat, a player may choose to have a Straining Move card he performs unable to be stopped or prevented.” This must be declared immediately when the attack is performed. Since you use this immediately when you perform an attack, you would make this
decision before you would get to use any other “When you perform an attack” effects.