I faced a shipmaster player that kept rushing me and he’d drop some kind of AOE between my buildings. It basically killed off 2 buildings instantly and then I lost in the resource game eventually having to rebuild a generator + supply pad
It seems to take buildings down to ~ 10% HP
Sounds like the scout mine glitch where it can be set on your base and detonate and kill a building or two.
Once again I just wish we had replays/spectator functions to be able to learn these things from watching ourselves. But yeah, what Sniping piikey said, it sounds like scout mines.