I shouldn't have to say this but here we are.
It's a free kill.
If I make a call out that a roamer is in a room, that info is only good for a couple of seconds. I made a call out that pulse was in kitchen. My friend then gets killed by pulse about 30 seconds later. My friend got mad at me and blamed me for his death. Just because a callout is made, doesn't mean it's true for the rest of the match.