It's hard to be sure just how capable Vision and Wanda are, though they are definitely powerful. I honestly think, with what we have seen, that Wanda will be terrified and Vision will be held back by trying to worry about her. I think Vision tries to defend Wanda rather than 100% on himself and gets pummeled by Hulk until Hulk moves on to Wanda. He may not be able to cause any lasting harm to Vision but can win via broken heart.
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