Scary

Russ had not fought with that freedom in a long time. The kinetic force of his charge drove the Alpha Legionnaires back towards their teleportation loci, fighting furiously just to avoid the annihilation on the edge of the frostblade.
Bjorn had seen enemies dissolve entirely in the face of his primarch's charge. He had seen xenos turn and flee, and even Legiones Astartes formations buckled when faced with the psychic shock of the unleashed Wolf King. The Alpha Legion, though, held firm, falling back in steady ranks, fighting hard, still trying to bring him down.

Wolf King pg. 61