I have this sentence in something I'm writing:
She slipped her head into the helmet with the same enthusiasm she would have slipped it into a guillotine.
This sounds wrong to me. I feel like it should be something like:
…with the same enthusiasm she would have shown slipping it into a guillotine.
Some kind of problem with the tenses, perhaps.
Is this wrong, or is it just me? If so, what rule of grammar is it breaking, and what alternatives exist, ideally less wordy than my proposed alternative?