Mina's Sanguine Retreat + Quicksilver Reload results in bonus ammunition.

[Mina The Vampire]

When you use a fully upgraded Sanguine's Retreat you gain 8 additional bullets, after this use an ability imbued with Quicksilver Reload (in my case I used rake) and this causes an additional 8 bullets to be added. I believe this is a bug, if it is intended please ignore and let me know.

The game is absolutely amazing by the way.