You are an FY2 Doctor on the acute medicine ward. You have been asked by your registrar to watch the final year medical student take an arterial blood gas from a patient. The medical student is knowledgeable about the procedure itself but when they do the procedure, you do not feel that their technique is adequate. The medical student asks you to sign off their competency. You have two patients still waiting to be seen.
Choose the three most appropriate actions to take in this situation: