Probably depends on the mission how someone might know. The bird task they could've done that, the scarecrow one they probably couldn't.If I was a traitor who was on a team with someone who got a shield, and we kept it quiet. I'd think of potentially choosing them to 'murder', knowing it won't go through. That person with the shield can then realise they were the target the next day and hopefully also deduce that the people on your team (you and maybe someone else) are surely not traitors because they knew they had the shield.
Probably over-complicated and would need to be later game as some would wonder why you're still alive as a safelisted player but still.
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