No. Nick went with the option that Renard was arguing with someone over the speaker phone, hence no need to warn Adalind about crazy Renard.
If he honestly thought Renard was crazy, I don't think he'd sit on that info knowing Adalind's uneasiness to send Diana back to her father.
If he honestly thought Renard was crazy, I don't think he'd sit on that info knowing Adalind's uneasiness to send Diana back to her father.