The blast that the anima released from its crystal was dangerous enough to kill an ELITE Rank and seriously injure a PHANTASMAL. If Mark just goes towards the crystal to attack it, the monster would have a clear shot with its laser. That meant Mark had to find a way to either sneak up on the monster or put it in such a state that it couldn't use the crystal to attack him while he was going in for the kill.
'And since I haven't seen any sort of eyes on that monster, I can only assume that it sees through the crystal. Trying to attack the crystal might mean opening myself to a counterattack before I can get close.'
Mark's feet landed on the ground and he suddenly dashed forward as the large monster tried to stomp him under its feet! Mark darted into a house at the side, and the monster grabbed the house before swinging its feet towards the entrance, sending rock and debris flying in every direction as the building was destroyed!