If using ANY ability will lock you in the zone and make you wait at zone exit for gankers to get their free kill?
For example: If you hit someone with your bloodletter E, you will get in combat with him. If you dashed but hit noone with it, you won't be.
After the last time you interacted with someone you went in combat with, a timer will start. After about 20-30 seconds you will leave combat and be able to zone.