Echo Shard does not provide additional damage for Bebop's bomb.

[Holliday]

After Bebop places 2 bombs on an enemy hero, upon their death, he still only gets +5 damage instead of +10.

 

[Gboon]

This is hero ruining if you go in building echo shard and it just doesn't work, hopefully we get a hotfix fast.

 

[hellduke]

Is this a joke post? Echo shard does not have anything that would make it 10%. The ability is that you get 5% damage incrase if they die within 12 seconds. Wether it was 1 bomb, 2 bomb or 3 is irrelevant, the expected behavior would be 5% increase since it's not the bomb that gives you the increase, it's the player death. You didn't suddenly get 2 kills just because you slapped 2 bombs onto one enemy. So what you described sounds like behaving as expected.