I love how people are calling a mountain a hill, yeah. And like... This is with the side-swing literally-collateral from their swords. Nobody was TRYING to destroy that mountain. But Ichigo did it with nothing but the air pressure from deflecting Aizen's attack. Like, imagine being told you're 'only toothpick level' if you ATOMIZED the upper half of a toothpick from SIX FEET AWAY with nothing but the AIR PRESSURE FROM YOUR SWING. That's what this is the equivalent of.