They wielded a lot of mana, that's why they were able to direct a huge amount of wind toward the beast enough to cause it to be staggering like that.
Now that the beast was somehow disoriented and had lost stamina, it was about time for the other warriors to find their way to the beast's core and damage it to the best of their ability.
And without wasting time, the warriors jumped heading toward the beast's core as it was still staggering. And you know what? They succeeded without the beast trying to stop them or something.
It was too disoriented to stop them, so reaching its core was so easy. But if they're not careful, they could get killed while being on its core.
Both warriors began making use of their swords to stab its core at the back of its neck. They were stabbing it with speed, their swords kept going in and out of the beast's core.
