Final answer:
The best first response for Julio, who experienced a flash burn to his face, is to perform first aid treatment for burns.
Step-by-step explanation:
The best first response for Julio, who experienced a flash burn to his face, is to perform first aid treatment for burns. The first step is to assess the burn. In this case, there are no blisters but the facial hair has been burned. Next, it's important to cool the burn by running cool (not cold) water over it or applying a cool compress. This helps reduce pain and further damage from the burn. After cooling the burn, it's recommended to cover it with a sterile nonstick dressing or cloth to protect it from infection.