Seeing one of the martyrs alive signifies that the path and conduct followed by that martyr will continue among people.
Seeing a martyr alive signifies nearness to Allah Most High.
Seeing someone martyred while fighting in the path of Allah signifies mercy and forgiveness, Paradise and blessing, good and abundance, success and salvation, and happiness in both worlds.
Seeing oneself martyred while fighting signifies success and salvation in this world and the next, departing this life with faith at the last breath, and receiving the mercy and forgiveness of the Almighty.