Lancer prepares himself the best he can. He is in his spear form, after all. He lets Caster fire him, and he does what he can to make sure it's a straight shot.

Caster's aim was spot on, and Lancer's spear form was strong enough that they blast through the ayakashi, burning through it's body and causing the beast to crash down to the ground with a loud bang.

And Lancer was already through, landing away from the beast.