The 2 Types of Perks/Runes (Spinning Death Flail and Venom Momentum Rune) which drop Poison/Fire Bombs on Heavy Finishers will not always apply Fire or Poison Damage to enemies when they explode even if the explosion was literally RIGHT on top of an enemy. I have seen this many of times especially when using Hammers with these perks. I would hammer a guy into the ground and the finishing move would create a poison and/or fire explosion on his body directly but the enemy would not have either applied to them when he is still alive.

I also notice this takes place quite often with a lot of weapons that knock enemies back a ways on their Heavy Finishers. I cannot tell if the finisher is knocking the enemy outside of the explosion or if the bug is taking place and not applying the status effect. If it's not the bug, I would strongly suggest increasing the AoE of the bomb a bit more so it's more consistent to applying against the enemy the player is attacking.

Lastly, not sure if the perk for the Spinning Death is available as a Diamond Rune ("Heavy Finisher Hits have a chance to drop a Fire Bomb"). I have spent hours collecting all the different Diamond Runes (currently have 38) and during all my times of resetting to try and obtain specific ones, I have yet to have seen this as a Rune. I have only seen the Poison variation and it seems to be exclusive to killing Order members--I've noticed some runes are either exclusive to the Order as drops or have tremendously higher rates than at the store. So not sure if this Rune is exclusive to some part of the game or if it just doesn't exist at all. Anyways, if someone could confirm to me if they have by chance ran across this rune, I would appreciate it.