Think not of the fire for a moment. Pause, reflect, consider, understand the flow of magicka that is essential to your being.
Do not believe this task to be above you. Do not believe that you cannot understand these forces. It is your magicka. It is your power. It is yours. You will find that it is more familiar to your mind than the back of your hand.
Raise one arm. Feel how this movement diverts the flow. Flex your claws. Feel how this motion inscribes a net of power. Take a moment to determine how you may direct this flow and deploy this net in a bolt of energy.
To cast a spell, one must focus one's imagination and willpower on transmuting their natural magicka into something elemental. Your imagination and willpower, they are the keys. You have demonstrated admirable quantities of both in recent times. Think of the stream of magicka you have at your command. Think of fire itself.
Now. You will gather a ball of magicka in your fist. It will be easier than opening your eyes. You will ignite this ethereal ball. It will be simpler than falling asleep. You will project this bolt of elemental fire towards the targets. It will be more natural than breathing.