A9o BB on T85fd: Defend Versus Cheap Iso

Hero
A♠9♦
Position
BB vs SB
Pot
Limp-Raise Pot
Flop
T♣ 5♦ 8♣

Facing a tiny squeeze from a loose SB over limpers, folding A9 offsuit in the big blind gives up too much equity and is too tight.