TAG makes a mistake?

[Yerma]

I've been giving too much action recently in a lot of hands! So, that brings up a question about a hand I saw recently. I folded preflop.

My question is, shouldn't TAG have raised the flop if he intended to play? He had a player in between himself and the action player. Or is this just spewing?

TAG is a TAG.
I have these notes on the SB:
open calls hijack (Q9s); calls down AT-high h/u vs pf raiser on raggy board; multistreet bluffs into pf raisers on coordinated boards


Absolute 1-2, 8-handed (no converter)

Hero holds K [img]/images/graemlins/spade.gif[/img]T [img]/images/graemlins/spade.gif[/img]

Preflop:
3 folds, TAG raises, CO calls, 1 fold, SB calls, BB calls.

Flop: J [img]/images/graemlins/club.gif[/img]9 [img]/images/graemlins/heart.gif[/img]J [img]/images/graemlins/diamond.gif[/img] <font color="red">(4 BB)</font>
SB bets, 1 fold, Hero calls, 1 fold.

Turn: T [img]/images/graemlins/club.gif[/img] <font color="red">(5 BB)</font>
SB bets, Hero calls.

River: 7 [img]/images/graemlins/heart.gif[/img] <font color="red">(7 BB)</font>
SB bets, Hero calls.

Final Pot: <font color="red">(9 BB)</font>
SB has K [img]/images/graemlins/club.gif[/img]3 [img]/images/graemlins/club.gif[/img] (pair of Jacks, King-high)
Hero has K [img]/images/graemlins/spade.gif[/img]T [img]/images/graemlins/spade.gif[/img] (2 pairs, Jacks and Tens)