HU phony river bet?

[Nybster]

This is from a PP 10+1, heads up vs a regular 10+1-donk

Seat 3 is the button

Seat 2: Villain $4010
Seat 3: HERO $3990

Level:6
Blinds(100/200)

** Dealing down cards **

Dealt to HERO [ 4 [img]/images/graemlins/diamond.gif[/img] A [img]/images/graemlins/heart.gif[/img] ]

HERO raises [300].
Villain calls [200].

** Dealing Flop ** [ T [img]/images/graemlins/heart.gif[/img], 5 [img]/images/graemlins/heart.gif[/img], J [img]/images/graemlins/club.gif[/img] ]

Villain checks.
HERO bets [350].
Villain calls [350].

** Dealing Turn ** [ 4 [img]/images/graemlins/spade.gif[/img] ]

Villain checks.
HERO bets [500].
Villain calls [500].

** Dealing River ** [ 2 [img]/images/graemlins/club.gif[/img] ]


Villain is all-In [2760]
HERO ?

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There was no need to push pf with the blinds so small, so I minraised, he waited a few seconds and called.
On the flop I made a standard cont. bet and he called w/o hesitation, I figured standard continuation call if there is any such thing [img]/images/graemlins/smile.gif[/img]
On the turn I hit a 4 which I wasn't too excited about, but I bet out again, still pretty cheap though, he called again, by this time I put him on a flushdraw or possible str8 draw.
On the river he pushed after a couple of seconds!

I think this looks very much like a busted draw trying to buy me out, does anyone call in a similiar situation?

Appreciate comments on whole hand!