2 NL hands, Did one result in the call on the other?

[MediaPA]

I had just joined this game, and I had never played this person before. So no read at all. All the hands had been called or raised preflop with no action after a bet on the flop or later. So a tight game

Hero ($2449.50)
Button ($2558.50)

Preflop: Hero is BB with A[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/club.gif[/img].
<font color="#CC3333">Button raises to $150</font>, Hero calls $100.

Flop: ($300) 6[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, Button checks.

Turn: ($300) 6[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets $300</font>, <font color="#CC3333">Hero raises to $1200</font>, Button folds.

Final Pot: $1800

A few hands later after the same basic trend. No action. no real betting. $50 bets were taking every hand if they were bet at all.

Hero ($2674)
BB ($1825)

Preflop: Hero is Button with T[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/club.gif[/img].
<font color="#CC3333">Hero raises to $100</font>, BB calls $50.

Flop: ($200) K[img]/images/graemlins/spade.gif[/img], Q[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, Hero checks.

Turn: ($200) 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, Hero checks.

River: ($200) J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $200</font>, <font color="#CC3333">Hero raises to $800</font>, BB calls $600.

Final Pot: $1800

BB had pocket 3s

On the first hand, should I have min raised or just called and bet into him on the river. I don't think he had any more in him unless he hit something on the river (straight or full house)?