I’m not sure I’m understanding your question correctly, but generally if someone is “too high” and “greens out”, they will be likely to have a panic attack, show general paranoia, and symptoms like dizziness and nausea. It’s not really a medical emergency, although to the user it probably will seem like one. There is no need to provide treatment other than making the user feel comfortable. Over time, they’ll come down and be fine again (but maybe a bit tired from the ordeal).

I speak from experience, as someone who has greened out several times in the past.