As Clark flung the door open, he looked at Maria carefully. His eyes darted side to side while he looked at her body and the worried expression that she had. " Isa started to help her ice maiden to grow without me. You helped her in case she would be hurt. I understand." The split second response without Maria even saying a word made her stunned.
"How did-"
"You have goosebumps on your arm from being cold, you seem like you are worried and if anyone were to ask you for help it would be Isa and not Grace since Grace isn't focused on increasing her ice controlling skills right now. That means it has to have been Isa that asked you for help." There were other subtle things like the frost on Maria's shoes but Clark didn't say anything else.