Hermit crab insta-kill

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I was just looking around my nest on the surface and I observed a hermit crab crawl up a ramp which was right next to my nest and dangerously close to the crab. I didn't see my ants engage in battle, and the crab just crawled along.

Looking around my nest more, I saw an adult devil's coach horse beetle (which later attacked my ants), engage in combat against the crab. It bit a few times before it sprayed the gas and the hermit crab just died. I like to hold alt a lot to see health values, and if memory serves, the crab should've been at full health.

None of them were uber.