TL;DR - Dota 2 Mechanics - Backdoor Protection HD
This is the website used for measuring the distances: http://devilesk.com/dota2/apps/interactivemap2/ Backdoor in Dota 1: http://i.imgur.com/0fZx2La.jpg Remember, 1800 range = full blink and a half. Backdoor protection turns back on 15 seconds after the last creep in the backdoor protection range dies. Check out my stream at: http://www.twitch.tv/moromis