Good question. Since this was the trainer for the opposing team, I would not immediately remove the player. I share your concerns about potential liability in this case. I think that I would:
1. Call the player over to his bench.
2. Tell his head coach what the opposing trainer has said.
3. Report that you had observed no such signs, but you wanted to give the coach the information and allow him to make a decision.
This approach takes action based on the information you received. Since that information is not the kind that triggers our concussion policy, you're not required to send the player off. But it also permits the coach to make a decision of his own about the player.
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Cheers,
mb
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