Villan is running a 36/20 with an agression factor of 28 on the final table and has been collecting chips from the small stacks looking to ladder.I have an image of being a stack bully and running the table for most of the final,but also have shut down when getting played back at with questionable hands,and showing down with solid hands when i do showdown my question is, is this a clear fold or is it possible hes bluffing here knowing im folding weaker hands than he might be reping and might just be on showdown value or bluffed flush miss trying to get me off the hand ? 

Its the final table and pay jumps are starting to get significant

WPN, 6,000/12,000 blinds, 1,500 ante No Limit Hold'em Tournament, 5 Players

Poker Tools by CardRunners – http://www.cardrunners.com/

SenorRawPower (CO): 155,794 (13 bb)
IDoDanny (BTN): 1,031,126 (85.9 bb)
honestbroker (SB): 223,886 (18.7 bb)
Hero (BB): 1,007,893 (84 bb)
spewtime (MP): 311,301 (25.9 bb)

Preflop: Hero is BB with Ah Kd
2 folds, IDoDanny raises to 24,000, honestbroker folds, Hero raises to 48,000, IDoDanny calls 24,000

Flop: (109,500) Th Qs 5s
Hero bets 54,750, IDoDanny raises to 109,500, Hero calls 54,750

Turn: (328,500) Ac
Hero checks, IDoDanny bets 109,500, Hero calls 109,500

River: (547,500) Td
Hero bets 273,750, IDoDanny raises to 762,626 and is all-in,