system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] if Thor is holding mjolnir, can hulk use him for the fastball special?

What constitutes "wielding" mjolnir? If Thor is holding it, do they become one object?
gpt
In the first Avengers movie when Hulk and Thor crash into Grand Central, Thor is holding Mjolnir. Hulk punches Thor and he goes flying off-screen, Mjolnir in-hand...

Does that help answer your question?

ADDED:No, Thor & Mjolnir do not become "one"  -- For starts Thor is not enchanted, Mjolnir is.

And no, being hit and being wielded are NOT different when it comes to Mjolnir.  Proof: If Mjolnir was sitting on the ground, Hulk could not punch it out of the way.  -- but as mentioned, punching Thor while he is holding Mjolnir works to move them both.

Ergo, the two do not become one. (or more accurately, Mjolnir's enchantment doesnt extend to Thor)