I know that Slashing Flourish, and the rest of the options, deal extra damage to the original target, but I'm asking if the damage it deals to creatures of your choice within 5 feet of you counts as damage from the attack.
Slashing Flourish. You can expend one use of your Bardic Inspiration to cause the weapon to deal extra damage to the target you hit and to any other creature of your choice that you can see within 5 feet of you. The damage equals the number you roll on the Bardic Inspiration die.
I am mainly asking this to see if it qualifies for the Dhampir's vampiric bite feature
When you attack with this bite and hit a creature that isn’t a Construct or an Undead, you can empower yourself in one of the following ways of your choice:
- You regain hit points equal to the piercing damage dealt by the bite.
- You gain a bonus to the next ability check or attack roll you make; the bonus equals the piercing damage dealt by the bite.