Donk move by him or bad move on my part?

***** Hand History for Game 3510582538 *****
$25 NL Texas Hold'em - Tuesday, February 07, 11:30:02 EDT 2006
Table Table 64921 (6 max) (Real Money)
Seat 4 is the button
Total number of players : 5
Seat 1: johnnyBuz ( $25.60 )
Seat 4: Sollevino ( $22.50 )
Seat 6: jspur ( $25.45 )
Seat 3: PaPrime ( $35.65 )
Seat 5: ry1180 ( $21.75 )
ry1180 posts small blind [$0.10].
johnnyBuz posts big blind [$0.25].
** Dealing down cards **
Dealt to johnnyBuz [ 2d Kc ]
PaPrime folds.
Sollevino folds.
ry1180 calls [$0.15].
johnnyBuz checks.
** Dealing Flop ** [ 4c, 5s, Ah ]
ry1180 checks.
johnnyBuz bets [$1].
ry1180 calls [$1].
** Dealing Turn ** [ 3c ]
ry1180 checks.
johnnyBuz bets [$2].
ry1180 calls [$2].
** Dealing River ** [ 6s ]
ry1180 checks.
johnnyBuz bets [$4].
>You have options at Table 65172 (6 max) Table!.
derbydog has joined the table.
ry1180 raises [$8].
johnnyBuz calls [$4].
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***********SPOILER*************
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ry1180 shows [ 3s, 7s ] a straight, three to seven.
johnnyBuz doesn't show [ 2d, Kc ] a straight, two to six.
ry1180 wins $21.40 from the main pot with a straight, three to seven.
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Bet harder on the turn. River try to get a little cheaper showdown but I dont have a problem calling a min raise from him on river.

yah im just confused why he called with essentially 1 out. i doubt he thought he had the best hand with a pair of threes.

He must have "felt" a 6 coming.