See, that's what everyone keeps saying, but it's simply not true. An Ancient Runner is not only really hard, or neigh impossible to hit. It also has a lot more health than people think.
You can tank PB buckshot, you can tank at least 8 M41A bullets fired at you from one tile away.
You can tank entire autocannon bursts from one tile away and then just run away with 2/5 health.
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This is without queen warding....