spoiler...

frankly, that scene letting sandman go was about forgiveness. it actually appears like the sandman disentegrated after spidey forgave him, but they left it open ended. honestly, how could spidey have 'captured' him? he tried water. i was waiting for him to try mixing dude with concrete (they were on a construction site). however at that juncture, spidey had forgiven him and looked emotionally and physically exhausted. he couldn't have beat sandman then if he wanted to. i didn't feel a way about it.
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wow. i still post on message boards. lol.