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starcraft pathfinding
(hexbear.net)
Tabletop, DnD, board games, and minecraft. Also Animal Crossing.
3rd International Volunteer Brigade (Hexbear gaming discord)
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yeah looks like the SCVs were tasked to a mineral patch then just as the last one was passing the dragoon they must have been given a move command to a non-mineral patch location making them lose the magical no-collision property with one suddenly occupying the same tile as the dragoon which was boxed in.
This is a tactic usually referred to 'drone drill' or 'drilling' but it's exactly as you described. the technique is so effective but to pull it off requires immense amounts of focus and speed.
It's very useful vs early zealot rushes when playing as zerg, as you can effectively stop the units from doing damage while you build zerglings