It's just something high-APM players do, I don't do it.
So, question about Klontas Mire: why can he see this overlord?
No air units nearby, he doesn't even have a starport yet. I have nfi where my overlords are supposed to go on this map.
Also I'm getting really ****ing annoyed/frustrated with mines. Just played a game against a Terran where I spent the whole time really far ahead and yet still felt completely constricted in terms of map control because he just left widow mines all over the map, especially around his bases. Every ling runby either needs extremely careful micro with overseers present (which I don't have time for with my ****ty APM unless I want to be useless at doing anything else) or I just have to accept that 10-20 lings will die every time I want to try to interrupt his mining.
It's so tilting that it's basically designed to murder the **** out of the most commonly made Zerg unit. mbn to put down sick static defense for ling runbys that costs only 75/25, wish my spines were anywhere near that effective.