River spot, HH and hypothetical question

[Mary59]

The villain here is 27/14/1 over nearly 1k hands. So far at the table I have just been playing standard 22/19 for around 50 hands and have not been seen to be out of line.

Full Tilt No-Limit Hold'em, $2 BB (6 handed) Hand History

CO ($491.85)
Button ($213.95)
SB ($348.80)
BB ($380.10)
UTG ($80)
Hero ($200)

Preflop: Hero is MP with 3h, Ah.
UTG checks, Hero raises to $9, 1 fold, Button calls $9, 2 folds, UTG folds.

Flop: ($23) 8h, Qh, 5s (2 players)
Hero bets $17, Button calls $17.

Turn: ($57) Tc (2 players)
Hero bets $41, Button calls $41.

River: ($139) Ad (2 players)
Hero checks, Button bets $86

Hero??

Here I think that I should have called, as he has played his hand very much like a draw, and that card scares alot of my range so it is good for him to bluff at. Also I feel any other made hands would have either raised earlier or check behind for showdown. Do people agree?

Perhaps a more interesting question is what to do in the general situation where a scare card comes that does not help my hand. For instance if I had KK here, he could well have played the nut fd like this, but that is only a small part of his range. Should I call then??