Board Thread:Speculation House/@comment-131.123.61.0-20140416144504/@comment-3146930-20140416204207

Pyrrha for as strong as her Semblance is isn't invincible. Yes she could force your weapon into the ground or disarm you with her ability, but she would also have to constantly focus on using that power for the remainder of the fight, having one hand constantly outstretch to prevent you from using a weapon while only leaving herself one hand to operate her own. This would probably also limit any sudden movements she could make, including dodging attacks or even running, as any sudden movements could break the connection.

Also using this ability constantly could be considerably draining, as Weiss was shown to be tired after she used her Semblance repeatedly during the fight with the Nevermore. Plus if the opponent was moving quickly, like Sun or Ren, it would be very hard to actually get a lock on them; especially if Pyrrha was already engaged in close combat.

Last thing to consider is that even if Pyrrha's power is strong against humans, it is almost useless by itself against the Grimm, the monsters that are said to be trying to wipe out humanity. Sure Hunters go after criminals, but their main focus is defending people against the Grimm, that for some reason have their eyes on humanity.