Delicious

Robin furrowed his eyebrows as he looked at the demon for a long time

This time it wasn't a look of hate or disgust, but rather a look of marvel...

After a few minutes, he thought of something and then let out his spiritual sense to envelop the demon and sent through the Thoughts conveying Technique, "Don't look in my direction."

*SHAA*

Just the moment he finished his sentence, Robin was left speechless as the demon actually turned his head completely to the right, and did it so fast and in a decisive way that Robin thought for a moment that his neck tendons would be torn!

"What the...?!" Robin mumbled to himself, that creature can understand his words?!

When Robin used the Thought conveying Technique on him previously, he just wanted his angry intent and strange words to appear in the demon's head to scare him, 

And as such he used his original language to transmit to him the two times and not the language of this world!