Update.

Kendall pulled down the window blind and there was no visit from the cardinal. It is now up again but he has 'perched' a fake parrot given to him by his daughter (don't ask!) just inside the window where the cardinal lands. The Parrot is as red as the cardinal.

I think he's trying to give the poor little thing a heart attack but, based on the thump when it taps the glass, we may find that it has pecked its way in to deal with the rival!