facing shove deep in BVB sit.

11$ Rebuy, Party

blinds 800/1600
average ~33k

Sb 15/8/3.0 w/ 25k
Hero BB w/ 37k

folded to sb, who completes

I pick up A3o and raise to 4800, he calls pretty fast

Flop: Ah Td 7d SB shoves prettttyy fast...Hero?

i would really appreciate some answers. I think this is kind of a tough spot.
Villain is pretty reasonable and to me his line didnt make no sense. I thought he might play some kind of draw like this. I have been pretty active so far, so he probably didnt respect my raise that much.
Another aspect is the tourney situation: If I win this pot
I am close to chiplead, if i loose i am still alive w/ about 15bb

[willperkins]

There is t12400 in pot and SB only has t19400 left, so the fact that he shoves would stand to reason. I don't know anything about his style, but I would think if he had an Ace,he would have raised you preflop. Since he didn't, he is either on a draw or hit the ten or seven.

There is t31400 in the pot and it costs you t19400 to call. That is 1.6 to 1 odds and you are probably ahead with your Ace right now with two cards to come.

I would call, but I would be nervous!!