I'm completely miffed at this call by another 2+2er

[Sponger15SB]

NL Hold'em $30 Buy-in + $3 Entry Fee
Level:7 Blinds(150/300)

Seat 1 is the button
Total number of players : 4
Seat 1: Sponger ( $2310 )
Seat 5: Anamik ( $1900 )
Seat 6: 2+2er ( $2760 )
Seat 7: rolos13 ( $1030 )

** Dealing down cards **
Dealt to Sponger [ Xd Xs ]
rolos13 is all-In [1030]
Sponger folds.
Anamik folds.
2+2er calls [730].
** Dealing Flop ** [ 6c, Jc, 5d ]
** Dealing Turn ** [ Ac ]
** Dealing River ** [ 7h ]
rolos13 shows [ Kc, Ts ] high card ace.
2+2er shows [ 3s, 7c ] a pair of sevens.
2+2er wins 2210 chips from the main pot with a pair of sevens.
rolos13 finished in fourth place.
rolos13 has left the table.