Phantom

The phantom human flew inside the caved trunk and was soon led to an underground area where he could see the three with their injured colleagues however they weren't alone in this place because they were other human beings that layed on hundreds of small benches that was layed inside this place.

Since his presence could not be noticed, Phantom waited patiently to see what they were going to do now.

The trio layed the injured members on the ground and immediately began treating them with pills, one of them stood after he finished attending to his own that have fainted from the poison but were slowly healing due to the pills.

"Ha, those bastards really caught with us at such a time that we weren't prepared and managed to knock out some of us"

"Who do you think it's behind this?"

"The yellow horn black wing off course, they are the only one who knows of our whereabouts because this cave we used as our experiment camp belonged to them"