NL50: second barrel turn oop

[M.P.Rator]

PokerStars No-Limit Hold'em, $0.50 BB (5 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

Hero (UTG) ($63.70)
MP ($50)
Button ($48.50)
SB ($38.10)
BB ($104.65)

Preflop: Hero is UTG with :js, :kh
Hero raises to $2, 1 fold, Button calls $2, 2 folds

Flop: ($4.75) :8c, :ts, :4s (2 players)
Hero bets $3.75, Button calls $3.75

Turn: ($12.25) :9s (2 players)
Hero bets $8, Button calls $8

River: ($28.25) :8d (2 players)
Hero checks, Button checks

Total pot: $28.25 | Rake: $1.35

villain: unknown

war mir nicht sicher, ob hier ein second barrel angebracht ist oder nicht. third barrel ist total ausser frage, oder?