a better idea is to load 1 sentry in a warp prism and use one round of warp in to attack the zerg main while forcefielding the ramp.
There you go. Way better. Another would be just forcefielding the mineral line. Its possible to prevent drones from escaping and lings from flooding in with just 4 forcefield. With 4 full energy sentries, it is possible to killl the entire mineral then pick up and just leave
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