Other adepts? Indeed, she hadn't though of it. While Cale was burning the wood as requested, Marta kept an eye on the sleeping Isaiah as she said

"No problem, if we catch anyone else using psynergy we can tell that they are cheating. Now, the trick would be us cheating without them noticing..."

Just when the girl though she was going to burn her fingers with the silly prank, Cale finished and she had now a small piece of charcoal blacker than night which, upon being rubbed with her fingers, these were painted black, although it was still hot so she used a little of her water to cool it down. Armed with the burnt wood, Marta jumped ahead of the group and when she was closer to the person laying on the ground, and confirming that it was indeed Isaiah, she chuckled trying to repress her laughter and started to think what to draw. An eye patch? Nah, the eye could wake him up, a scar? Yeah, let's put a scar on his left cheek.