"Yes. Let's see what you got." Guardian Fover fearlessly opposed Garros and called his subordinate, "I don't care who the human youth is. Make sure he survives."
As a Moon Guardian, Fover knows things that are privy to ordinary experts. Human Union knew Fiend Lord has offsprings, but that's all they knew.
As for how many offsprings he had, their strength, and how they look, the Human Union had no idea. Because all the Fiend Lord's descendants operate under his direct orders, so even human spies in the Fiend continent couldn't find anything.
Gin found out about Fiend Alyek because he was particularly searching for the blonde man and luck. In truth, Fiend Lord's timely call to his offsprings divulged the blonde Fiend's cover.
Hearing Guardian Fover's words, Fiend Commander Garros's eyes narrowed and emanated a cold light. It's his responsibility to send Young Lord Alyek safely back to the Fiend continent.