A bit unsure on the wording of this Agency card . . .
"Action: Choose a character you control and a character an opponent controls. Choose one of those characters to go insane, then wound the other character."
Say I'm playing Agency and all I have out are characters with Willpower. Is it still valid for me to choose one to "go insane" and wound the opponent's Cthulhu character, or would a character with Willpower be invalid to target for the insanity choice?