im doing the prophet quest where u need to find a moth priest in dragons bridge. as soon as i show up a dragon appears and kills both the guards there. and apparently the guards are the only one who know where this guy is. some please help me. is there any other way to complete this quest

If all the guards are dead, try re-entering the town. If that does not work, go south across the dragon bridge.

Reload a previous save and try again. If they still die, fast travel to Solitude instead, then run to Dragons Bridge. Fast travel increases the chance of random encounters when you arrive.

thank you my friend

Talk to the kid there. I had a high bounty so i couldnt talk to the guards.