EE was using an air lance 2 dislodge remaining mat'l with air. He jabbed at the blockage 2x & hot mat'l came out door burning ee ear. He then came 2 ctrl room 4 assistance. At no time did we believe that there was any hot mat'l remaining to drop above the tipping valve door as it was completely cleaned out during 1st step of job. Additional details available, no room 2 input.