In a 4-bet pot on a paired board, use small sizing to leverage your range advantage and avoid folding out bluffs too early.
Checking is the preferred play here to protect our range, though betting small is a viable alternative. By betting 31% pot, we are slightly larger than the optimal 25% sizing, which can narrow Villain's continuing range too much.
Note: Slightly too large on the sizing; a 25% pot bet or a check is preferred to keep Villain's range wide and realize our backdoor equity.
Folding here is a significant mistake despite the aggression. We are getting 2.7:1 and only need 27% equity to call, which our hand easily maintains against a range that includes many bluffs.
Note: Folding is too tight; we have the K-high backdoor flush draw and block some of Villain's value (KJs) while beating their air.