Hello! I gave a look at every "boss" thread in this forum, but is seems like no one is talking about this kinda-hard-to-figure-out-how-to-even-scratch-his-armor boss.
I'm in the frozen veil... I go to the left-most part of the stage, I climb up into a cave and then I do the whole stage in the sky jumping between the usual (and beautiful

) flying Bubbles, until I arrive at the Bubble Cave. At the end of this cave there is a big crab who spits mines out of his minds. It's possible to bind the mines but I can't figure out how to use those the mines.
Anyone can help?