Bottom set just a bluffcatcher?

Villain is 20/16 with 5% 3bet, 60 hands. Postflop AF of 2.0 (obviously a very small sample as yet).

I think calling turn to re-eval river is best, folding to a river shove. Not sure I can bring myself to fold to a half pot river bet.

Do you agree that we have little more than a bluffcatcher? He's unlikely to be doing this with AJ - on this flop he'd probably have raised that on the flop.

Poker Stars, $0.10/$0.25 No Limit Hold'em Cash, 6 Players
Poker Tools Powered By Holdem Manager - The Ultimate Poker Software Suite.

BTN: $25 (100 bb)
SB: $28.09 (112.4 bb)
BB: $25 (100 bb)
UTG: $27.37 (109.5 bb)
MP: $10.73 (42.9 bb)
Hero (CO): $28.43 (113.7 bb)

Preflop: Hero is CO with 7 7
2 folds, Hero raises to $0.50, BTN folds, SB calls $0.40, BB folds

Flop: ($1.25) 7 J A (2 players)
SB checks, Hero bets $0.75, SB calls $0.75

Turn: ($2.75) 8 (2 players)
SB checks, Hero bets $2, SB raises to $8