I've seen deer walk right in behind a coyote - I don't think a healthy deer - is too worried about a coyote generally.

I've also seen where coyotes have packed up and killed a deer -(sign left in the snow) - and the deer have moved off.

So I guess my answer would be yes & no. - My gut tells me the one coyote doesn't mean much - but a loud, stalking pack is another story as far as the local herd goes.

FH