Strong points
1 - Is really fast/simple to use .
2 - You can move Crow's head in any direction , so the spike can be shot from every angle
3 - The spike can stab through the enemy .
Weak points
1 - It's short ranged only
2 - You have to detach Crow's head , so when you need to use him again you have to attach his head again
3 - He can shoot only one spike .
Combo/Strategies
This is mainly used for finishing moves . Let's say that a Tai user dashes towards me and performs a Tai attack , I quickly use this technqiue and have crow shoot the spike , even if the enemy dodges it with effort , I will have a lot of time to perform another technqiue that would be fatal for him
Way to counter the technique
Since it is only one spike , it is kinda ... predictable at best . Also save your range , but if your enemy shoots it to you , you can very well use a wind technique to push the spike back , as well as the wind will also send away the head of Crow that is detached . So in this case the enemy will be at a great disadvantage , he will have to counter the spike , and then control Crow again to attach his head
You Doing the jutsu
Sasori concentrates chakra on his fingers and attaches some chakra strings on Crow's head . By performing a hand motion , Sasori made Crow to have its head detached . Now the head is floating in the air , then it opens its mouth to shoot a deadly spike towards the clone who is approaching Sasori . The spike made its way to the clone and stabbed him through his heart , making him to disappear .