Luke indeed didn't know exactly what this stone door was made of.
But just like how the Destroyer's skin hadn't broken even after being hit by an armor-piercing bullet at close range, this wasn't something that could be understood with Earth's current science.
While this unknown thing might contain benefits, it could also be a trap. It wasn't worth acting blindly.
Also, it would be very hard to move it, so Luke didn't pursue it further.
As they were talking, Luke heard some activity. He used his ability to probe the top of the pit for a moment, and a strange expression appeared on his face. "Daredevil and his ex-girlfriend are here. Don't move later; it'll be easy for this guy to detect us with his hearing."
Selina stood still obediently, but she couldn't help but ask, "Ex-girlfriend? Isn't he afraid Karen will run off?"
Pondering for a moment, Luke said, "What if he's treating them both the same?"
