read him like a book. can't play that any better.

pushing turn and making the guy pay his remaining stack to see his 19%'er instead of letting him off the hook if he didn't catch would actually be playing better. unless the read on the guy was that he was a maniac who would have pushed even if he had missed.

question would be is raszi folding this if river doesnt pair up and/or doesnt come a spade. Why does the guy behind you affect your decision on the turn? he has $65 left, safe to assume he wasa calling.

Your read is spot on. He is betting his draw. Therefore your play on the turn is idd bad. You should have pushed, i cant imagine those 61 dollars making a difference when you're a 80% favorite over moydickbrain and he still has 463 dollars that could be yours.
Another question though, why are you just callig his flopbet with such a drawy board? were you afraid of 78 or flush and hoped the board would pair up so you could pull in a monster? Or were you calling hoping for a nonspade turn, making a push with The AoSpades -ev?