Meruin scanned all of Mutts moves analytically. Not tactically, because she was not a fighter, no, but she was a researcher and a avid learner. The boy (wolf?) had tremendous strength even while not transformed, and that rock was not natural either. She could feel the magic behind it. Still, the power that would be coming from this blow was completely scientific, which just meant that Mutt was swinging it really hard.

It was not her battle, but she could tell that Sol was in a dangerous position. Getting hit by that would not be pleasant at all. Still, there was one very glaring weakness behind Mutt's attack, one that seemed rather obvious to even Meruin at first glance; destroy the rock, preferably from a distance. He was swinging that thing with so much momentum, that if it were destroyed, he'd still be forced to follow the trajectory of his swing. Furthermore, once that was destroyed, his energy would be wasted and his attack would have been for nothing.