How about I show you how to disarm someone, now that you mention it.

[She makes a good point, so maybe this is a better start than worrying about being grabbed. He creates a knife in his hand fashioned from hydro, but it noticeably doesn't really have an edge to it- an incredibly dull weapon that won't cut.]

Here. [He hands it to her, because he needs to demonstrate.] This can be used with anything someone's holding, but we'll just use a fake knife for now. Hold it out in front of you like you've tried to stab me, and I'll show you how to do this slowly.