His value range decreased ott because I'm assuming he would raise the flop with big part of his value range. I don't see him doing this that often with his worse Ax. He could be bluffing with QJs. We block K of spades which decreases his flop calling and turn bluffing range. Maybe call would be fine without having K of spades in this hand?
PokerStars - $0.02 NL FAST (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4
Hero (BTN): 335.5 BB
SB: 115 BB
BB: 71.5 BB
UTG: 100 BB
MP: 77 BB
CO: 311 BB
SB posts SB 0.5 BB, BB posts BB 1 BB
Pre Flop: (pot: 1.5 BB) Hero has K

A
fold,
fold,
CO raises to 3 BB,
Hero raises to 10 BB,
SB calls 9.5 BB,
fold,
fold
Flop: (24 BB, 2 players) A

9

T
SB checks,
Hero bets 14 BB,
SB calls 14 BB
Turn: (52 BB, 2 players) 4
SB checks,
Hero bets 32 BB,
SB raises to 91 BB and is all-in,
Hero calls 59 BB