Things that make you go "hmmmmmm..."

[sexobon]

The imagery is subject to wide interpretation; so, can't be used against him as easily as his words can in a saved text.

No response to your request for clarification could be designed to draw you into face to face communication which would be illegal for you to record.

He has already given any recruiter sufficient grounds (non-professional response) to discontinue recruitment and continued pursuit can no longer be construed as being in the line of duty.

Should you continue, for personal reasons, to take it to the next level with face to face interaction, have a witness with you at all times. There's absolutely no excuse for any problems to arise as a result of you letting yourself be alone with him. You're the pursuer: he didn't come to you for the job.