Do we call down here with such a good runout or is he very unlikely to triple air?

$0.10 NL FAST (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4: http://www.pokertracker.com

BTN: 134.3 BB (VPIP: 0.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 12)
SB: 225.4 BB (VPIP: 21.32, PFR: 17.77, 3Bet Preflop: 7.79, Hands: 197)
Hero (BB): 150.2 BB
UTG: 100.5 BB (VPIP: 26.35, PFR: 20.27, 3Bet Preflop: 13.33, Hands: 152)
MP: 129.1 BB (VPIP: 14.53, PFR: 11.97, 3Bet Preflop: 8.70, Hands: 119)
CO: 100 BB (VPIP: 50.00, PFR: 25.00, 3Bet Preflop: 0.00, Hands: 4)

SB posts SB 0.5 BB, Hero posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has 8s 5d
fold, fold, fold, BTN raises to 2 BB, fold, Hero calls 1 BB

Flop : (4.5 BB, 2 players) 2s 5h 9s
Hero checks, BTN bets 2.1 BB, Hero calls 2.1 BB

Turn : (8.7 BB, 2 players) 9c
Hero checks, BTN bets 5.5 BB, Hero calls 5.5 BB

River : (19.7 BB, 2 players) Qh
Hero checks, BTN bets 9.4 BB, Hero calls 9.4 BB