As part of the hardfork 21 there are 2 manabars: The principal one for upvotes and downvotes (the one with 1 million rshares per vesting share), and the second one only for downvotes (250k negative rshares).
Stupid question: if someone were to do two 100% downvotes per day, would the manabar with 1M rshares per vesting share remain unaffected?
RE: Complete guide to understand rewards in HF21 [Part 1]