On three occasions I have had dreams of men's death. I have not died yet but they all did.
One was my godfather, a very funny man. In the dream he was killed by a clown, but the next day he died of a heart attack at 39.
One was a high school crush. In the dream he fell off a cliff, but that week he suicided via gun.
Other other was another high school crush. In the dream he died in Iraq. In real life he died in Iraq.
I've never dreamed of someone I hadn't met yet, so that's weird. And the track record of accurate death causes is weak, even if in general the predictions of outcomes are pretty accurate.
In other (maybe prophetic) dreams that repeat like this I think the slight changes in the dream are changeable parts of the event. They fixed part (here the death) is not generally changeable. Thats partly why I lean towards not telling him?
I'm sure it could represent something else. Maybe I'm flooded/overwhelmed with the community efforts? Still it's very strange the coincidence of meeting random dream person five days after the dream and then chatting about a devastating flood at their place of employment.