Do you mind elaborating on what you think is wrong?
Hello, I am: Ahli - https://twitter.com/AhliSC2
If you notice the Artillery strike, it killed all of us; if you notice the proxy mine explosion, it damaged Proxy, but it didn't kill me
This is just wild speculation on my side, but judging from the time period between spawning and shooting the mine, I'd say you have still active spawn protection. Spawn protection doesn't remove the hit indicator so you also know when an enemy fires at you while you are in your spawn area.
FYI The yellow 50% in the middle of the screen is the spawn protection in-case you weren't aware.
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So spawn protection is a time limit defined and not area defined. But, doesn't FF negate that?