Ryan was in a bind. The only safe place was close to Cerberus, but even though the rage blinded the senses of the beast, the creature was smart enough to control its magic just right, and the space between the range of the attacks and the place where the monster was too small to fit the paralyzed Ryan.
"Screw it. At the very least, this dirty dog will go down with me… Wait, what if…"
Since he didn't have mana to do anything, Ryan's only option was to accept the risks. In the end, the blocks of ice fell around Cerberus, and the creature didn't notice anything unusual. However, after a while, the monster was attacked several times on its faces. That was odd, there was nothing in the direction the attacks come from aside from the blocks of ice, and Cerberus knew that Ryan could only use its weird technique as long as there is nothing blocking its path.