Uploaded May 2026 | Updated September 2026, 2 weeks ago

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This normally can happen whenever a gate is captured on maps like Mannhattan.
The time frame after a wave failure usually is too short for this and for it to occur you would need to have a Sentry Buster on the field to begin with.

It just so happens that I was the lucky person to experience this.
Game: Team Fortress 2