Currently, this does not in fact invoke the rat summoning theme, but the general-standard-vanilla summoning theme (e.g, rats, cats, gulls, and mongreldogs. What, did the rats form the FURRIFUL ALLIANCE?!).
Pretty sure it's a bug, so I thought I'd bring it to attention for fixing.
Thanks!
Actually, it's worse than that. My entire pc's summoning theme system seems stuck on default now; no matter how the focus is used. :'(