OF COURSE they did'nt go after them, I mean Sasuke's Amaterasu FAILED, those mere mortals stand no chance if the great Sasuke failed!
/end sarcasm
Anyways, are we so sure he is'nt back where they originally fought, sure looks like the area, they might have took back a replacement, if you remember right, a tentacle fell off during the Amaterasu attack.....they mighta took a replacement the 8 tails made instead, while he hid himself as a tentacle *shrug*
i like that idea but i dunno it wouldnt seem right