3bet flop shove 200BB deep HU

[pokeriseasy]

The match has been playing fairly aggressive, there have been a ton of 3bets preflop from both players, so my 3bet certainly doesn't mean a big hand it could be anything from an SC to AA. However SB's 3bet calling range has been somewhat narrow even as we have gotten deep. Also in 3bet pots the play has been pretty tame with no 3bet hand going to showdown yet. Early on in the match I was getting the better of SB but SB has made a comeback lately and it's been back and forth the last 20 minutes or so.

If you were SB what would you need to call this shove? SB also used his timebank before raising, and I instashoved, how does that affect your decision?

Poker Stars - No Limit Hold'em Cash Game - $2/$4 Blinds - 2 Players - (LegoPoker Hand History Converter)

Hero (BB): $945.75
SB: $857.25

Preflop: Hero is dealt XX (2 Players)
<font color="red">SB raises to $14.00</font>, <font color="red">Hero raises to $48.00</font>, SB calls $34.00

Flop: ($96) 3[img]/images/graemlins/spade.gif[/img] 3[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">Hero bets $64.00</font>, <font color="red">SB raises to $188.00</font>, <font color="red">Hero raises all-in to $897.75</font>