Professor Gregory took out a stone, and Shadow Eleven was puzzled, unsure of what to do next.
Professor Gregory's gaze fell on the stone, and he instructed, "Throw this stone to them, gently. If it's really Thor, he'll know what to do with it."
"Be very gentle!"
Afraid that Shadow Eleven might not take it seriously, Professor Gregory emphasized it twice.
"Understood."
Shadow Eleven took the stone, looked at it a few times, and saw nothing special.
It was just an ordinary stone.
Why did Professor Gregory say this stone could verify Thor's identity?
Shadow Eleven didn't doubt Professor Gregory's words. If he couldn't figure it out, he wouldn't dwell on it. Letting smarter people solve the problem was his usual approach.
"Step back a couple of steps. I have something to verify your identity. I'll throw it over, remember to catch it with your shadow!"