I don't remember ever seeing this summoning message, but I can't say that I've always been paying close attention either. I don't know if its Hylomorphic related, just some rare message I've never noticed before, or something else, but I figured I'd throw it up here and see if anyone knows anything.

>You hold your talisman tightly and concentrate on summoning your leopard.
>A fierce shudder runs through you, forcing your head back. A sudden flash of light reveals a brown leopard at your side.