All I know is the explosion used in the video was the Ring Explosion at the end of The Maw, not the PoA_explosion or PoA shockwave. I switched the AR impact_floodcombatelite on the Maw with the PoA Explosion effect, and I got a HUGE explosion (that blew up a few times each shot) and you could see the shockwave expanding outward from where I had shot, but there was no sound.
And when I finished the level and watched the ring explode as usual, I realized it was TAHT explosion that I needed, not the PoA_explosion.
Anyway, I tried saving the raw meta of the PoA_explosion from The Maw, then I opened up BG and saved the raw meta of the AR Impact Stone effect. The AR stone meta was 1,864 bytes, and the PoA_explosion was 1,640 bytes. So I opened up the Poa Explosion meta in my Hex Editor, and inserted 224 bytes (1,864 - 1,640 = 224). I then saved the Explosion meta, and went over to HMT again and tried to Inject my new PoA_Explosion Raw Meta (that was now the same size as the AR Impact Stone meta) over the AR Impact Stone meta, and it worked (I think), but when I tried to Save the map, I got a "Stream not writable" error.
Havn't tested the level yet, I will now. Let's hope it works...