Watching as Onoki signs his name in blood on the scroll.Taking note of the conversation Kakashi and Castiel were having, Onoki simply focused his attention to the scroll and pricked his right thumb.
Skillfully, with years of calligraphy practice under his belt, the old man wrote his name eloquently on the summoning scroll. The blood dried quickly as if being sealed... a new agreement was made between summoner and animal.
"Ah. Now, what's next?" he inquired.
Now it is time for you to try and summon a duck, we'll start of easy and summon a small duckling. So, bite your thumb again, or just use the same blood, then perform the seals and slam your hand on the ground, if you collected enough chakra you should summon a small duckling. If you do it, this duckling will be yours, you can name him whatever you want.
Castiel watches onwards, hoping the old man can pull off this simple task, even though Castiel believed he can.