Seeing those enemies, I decided not to rush and attack. I am a bit in a distance from them so the monsters did not see me, allowing me to hide. But to see a different colored goblin, I am wondering whether that thing was a variant or not.
Without any way to see the strength of the enemies, hiding from them is the best course of action I can do at the moment. Not because I am being a coward but because fighting against the enemies will just slow me down. I don't want to get too caught out with the enemies and end up failing the quest due to this.
I waited for at least 5 minutes before I went out of my hiding spot and continue my exploration. If I ever meet those guys, I will have to fight back without holding myself back.