99 on the bubble vs nit

PokerStars - $3.16+$0.34|300/600 Ante 50 NL - Holdem - 4 players
Hand converted by PokerTracker 3

UTG: 1,900.00
BTN: 2,510.00
SB: 4,060.00
Hero (BB): 5,030.00

UTG posts ante 50.00, BTN posts ante 50.00, SB posts ante 50.00, Hero posts ante 50.00, SB posts SB 300.00, Hero posts BB 600.00

Pre Flop: (1100.00) Hero has 9 9

fold, fold, SB raises to 4,010.00 and is all-in, Hero?

Villain is super nit (10/8/1.0 AF over 84 hands) who had been on my right the whole tournament and given me loads of walks (open folding his SB). BUT... he'd just doubled up off 5th and suddenly found himself with a playable stack to rival my own so could be loosening up. I'd been running the table over all tournament as they were all tight/weak. Call or sigh fold?