Good explanation. I use it when I have a hand that is probably ahead, but not necessarily. (I.e., TPTK, 2-pr or set, but 3-flush comes on the river). My blocking bets are slightly < 1/2 pot. A blocking bet on the river is small enough for worse hands to call you (for value), and at the same time, somebody with a monster will want more value and will raise (which costs them a lot), allowing you to get away from your hand.