If they have a temp of 104, start cooling immediately and call 911. No need to get fancy, although if you can only cool in a couple spots, under arms/on neck/he

If they have a temp of 104, start cooling immediately and call 911. No need to get fancy, although if you can only cool in a couple spots, under arms/on neck/head/chest is better than the extremities or something. The opposite, treating hypothermia, is much more technically specific in how to treat without harming the person more. Look it up if you will be in very cold wet places for extended periods. But if you don't know what to do, call 911 and ask them.