Depends on the difference in strength. Me fighting the cook? Yeah, our techniques matter. Luffy's a cut above, so I'd have to get really lucky if I ever wanted to actually stop him. Or throw him in the ocean, but that'd mean getting close enough to grab him in the first place.

[he's so casual about it, even though there's almost no chance he'd ever have to fight Luffy that way. Not unless another sea witch came along to possess him or something.]