Alucard knew that Asch would use a wind jutsu to neutralize his electricity. It's always like that.. Just as predicted Alucard created his wall of fire that Asch would just rush right into, while raising his sword but unprepared for the wall of fire that Alucard had created with his Hellsing gloves... As the wall of fire captured Asch on his way towards Alucard, the fire would form into a sphere as Alucard would utilize his gloves to perfect shape manipulation of the jutsus he'd produce with his gloves. The sphere would shrink inwards, with Asch in the middle who would be burned to ash in an instant.
So much for that scorch release that i wanted to see..