There's a small pause before Strange decides fuck it, might as well tell Yuya. "I wanted her to help me kill Nightshade. She wasn't fond of that suggestion."

Strange isn't ashamed of what he's saying: a part of him still wants to straight up murder Nightshade despite the very valid points the Ringmaster made. Likewise, he's not ashamed for wanting to do a murder in the first place. But he's already readying himself for a 'don't murder' talk from Yuya and is already getting prepared to defend himself as needed.