I spent my morning trying to duplicate this:
https://youtu.be/9vP8fQx-HXY
On the Templar
megathread, I speculated I was facing a 2Hander at the time. I'm sorry, I guess it wasn't a 2Handed attack that locked Explosive Charge's animation; who would have thought a light 1H sword attack would d the trick.
I came close, but failed to replicate it. Every fight was like this:
https://youtu.be/2Ix3JRexSzE
EC would glitch a couple times, during every prolonged fight when I was circle strafing and trying to line up my charge. I'm not exaggerating, literally every fight with multiple mobs, where I was trying to push the ability, I would see animation glitches and/or the ability not fire. Total run was 45 minutes - I would estimate about 50+ glitches in that time or 50% of my total charges.
So I switched to Shielded Assault and within two minutes (45 seconds to be exact) got stuck in animation when a pebble got between me and a mob.
https://youtu.be/TLiUkTSCA0c
Shielded Assault still glitched when pushed, but not as nearly often as EC. The experience with Shielded Assault was better than Explosive Charge. Even though, I got stuck, it was easy to recover - just blocked and I was free (no potion needed) and ability felt more responsive and easier to chain attacks off of.
Advice for charges - don't push the targeting envelope. Keep the target lined up in the middle of your view. Watch out for pebbles.
I should have tried Critical Charge, but I suspect all charges have issues working correctly you can just barely target a mob/player.