Apparently, when it rains or snows, marble gets super slippery, so they 'bake' the surface with fire to make it non-slip.
https://www.threads.com/@nonslipstone/post/DSl_lf4EZkg?xmt=AQF04pohTGQ8FeBzf6n5Paxf1dnRK3RZ4YUmm7yqJtpvqlfqanx25StVlzGMrF7q18wUlDcy&slof=1
"Users are sharing their wild guesses for the torching, ranging from K-BBQ to zombie containment, before learning the actual safety reason."
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