That final clip was really something, berserkers smashing into a shielded formation. Really gives you a sense of what some historical melee combat might have looked like up-close. Also goes to show that while a melee fighting unit's strength is known to have been largely a function of its coherence, this is a clear example of how it is not exclusively a function of coherence/organization. In this case, stronger, more energetic combatants were able to break into, and then break up, the formation entirely.