hand in ftp 1k

[aaaaaaaa]

the villian in this hand RR with JJ earlier got 4 bet getting over 2 to 1 almost folded his jacks timed down to 1 second he still woulda had workale stack if he called and lost. so in the hand in question blinds are 250/500 +ante folds to him on the button he has 20k stack i shove a4o in the sb with 10,800. the JJ hand was the only reason i shoved is this enough to shove a4 here? 20k was around avg stack for the hand i have a tight image.