Street by street analysis of a marginal hand

[Hebel]

*** FLOP *** [8c Qh 9c]
Hero bets $3
Villain raises to $10.45, and is all in
Hero has 15 seconds left to act
Hero calls $7.45
Villain shows [6s 6h]
Hero shows [Tc Td]
*** TURN *** [8c Qh 9c] [5s]
*** RIVER *** [8c Qh 9c 5s] [4s]
Villain shows a pair of Sixes
Hero shows a pair of Tens
Hero wins the pot ($23.90) with a pair of Tens
Villain is sitting out

The point of this post was to show that people dont always have monsters. You have to seriously evaluate a villains hand over a wide possible range and not just say that "hes never bluffing with underpairs" or something along those lines.