Hero doesn't go to war. KT vs donk bet

[BarryLyndon]

If you are going to raise this pre (which is marginal - KT is a hand I'd rather have suited / I'd rather have connectors from MP2), then please raise to ~5500.

Flop is standard, you are either going to bluff raise or fold depending on your opponent's tendencies. If you are going to bluff raise, PSB is best. Really just depends on a lot of factors. This could very well be J10, JQ, JK, even JA / set or a mid pair trying to win the pot. Rarely is it air, he's leading to protect something, especially considering where your raise is coming from. With that, probably a fold, unless you have a good read that player is tight and trying to avoid showdown.

Barry