The definition of robbery is taking something without permission! You can't really get permission without the shopowners around to ask!

[She's happy to let him go when he agrees, that smile of hers not dropping or growing in size - in fact, she's quick to just... start walking, expecting him to follow.
And she only stops to look over her shoulder when she notices she doesn't hear him walking just yet.

Look, at least he's with a fellow inventor?? He COULD be stuck with one of the nerds from 1-A or something...]