Something I thought of, but probably requires too much thinking and best to just not think about at all, is that maybe Hulk could just sense who the enemies were here. Seeing the Avengers battle the alien invasion, and then even Captain America telling him to 'smash' (at least, that was the german translation of what he said), probably made him realise this was his side.
Of course, Hulk has yet to show any kind of reason before that, so this seems illogical why he even went in for that spinning shot to begin with.
Maybe they will dig into this in another Hulk movie?
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