Grenades and melee attacks are tools for WEAKENING an enemy, and almost never work for finishing them off. Try to melee an enemy at full health? You're shot to pieces before you can even get close. Try to grenade an enemy at full health? Either it's an instant one and it isn't enough to kill them outright, or it's a DoT and the enemy just walks out of its AoE like it's nothing. In all of these cases, you have to finish him off with gunfire, which means no progress towards the -blam!-ing ornament. Try to do either of these things to an enemy that's already weak? Ally steals your kill because he's a -blam!-bag. Logical choice is a sword or melee based super as those kill in one hit, but the lock-on for either of those is -blam!-ed up beyond belief. You take a swing at an enemy that's not completely braindead and they'll just be calmly walking away and somehow nothing else is required for them to dodge every single one of your attacks. And it's even worse when you're trying to attack another sword/melee super user. You just keep swinging around one another like headless chickens until one person gets a lucky shot on the other or you both -blam!-ing run out. I'm 27 games into this stupid thing, and I'm only on 19%. Enemies that are killed shortly after your grenade or melee attack hits them should count towards this stupid ornament.