Advice? I really thought he was just chasing the flush with bad odds like all the people in 1/2 penny do.

PokerStars No-Limit Hold'em, $0.02 BB (8 handed) converter

Hero ($4.90)
MP1 ($2.46)
MP2 ($2.65)
CO ($8.74)
Button ($6.89)
SB ($6.39)
BB ($1.23)
UTG ($1.56)

Preflop: Hero is UTG+1 with 5, 4.
UTG calls $0.02, Hero calls $0.02, MP1 calls $0.02, 3 folds, SB completes, BB checks.

Flop: ($0.10) 2, 3, 6 (5 players)
SB bets $0.12, BB folds, UTG folds, Hero raises to $0.3, MP1 folds, SB raises to $0.48, Hero raises to $0.66, SB calls $0.18.

Turn: ($1.42) T (2 players)
SB checks, Hero bets $0.82, SB calls $0.82.

River: ($3.06) A (2 players)
SB checks, Hero checks.

Final Pot: $3.06

Results in white below:
Hero has 5s 4s (straight, six high).
SB has Th 7h (flush, ten high).
Outcome: SB wins $3.06.