Legger?

After seeing its weakness, Croco didn't waste any more time and approached the disabled zombie with huge strides. With his height, he was able to look down on it just like an assassin looking down on its prey.

Swishh!

The arm-blade mounted to Croco's right hand was then dyed with dark blood as the disabled zombie's head rolled to the ground. 

A System prompt also appeared inside Nile's mind confirming Croco's successful kill. Although it was not an assassin-like kill, he still nodded his head in appreciation towards Croco. 

"Very good! Get back to position!" He said after telling Croco the right way to be an assassin. Of course, he is not an assassin himself so he just taught Croco some basic information that every assassin should know. 

Just like, 

'Always lurk behind the shadow!'

'Kill when the opportunity arises!'

'Always aim for a decisive blow that could grant an instakill!'