KK 5-10 No-Limit

[Mens Rea]

5-10 NL at the end of a very profitable session. I'm killing time waiting for a friend to finish up before I cash out.

Black KK UTG - raise to 70 - the standard table raise. Next player calls (pretty bad, has @500. Then, in late position, a tight, older player with around 2k reraises to 210.

I put the late player on AA, KK, QQ or maybe JJ - these are really the only hands I've seen him reraise with, and I've been playing with him for around 8 hours now. I've been talking about leaving for the past 15 minutes.

What's the move here?