Gu Shanhai thought about turning around and fleeing when he foresaw that Sethanda Esohon was much more powerful than Duer Rahan.
But then he thought again, running away just wasn't right when he was still quite a distance from the southern forest.
Rather, it was better to strike first and prevent future problems, as his opponent was a future legendary hero. If Sethanda hadn't set out to kill him, Gu Shanhai would naturally have no need to be ruthless.
If it had been Gu Shanhai who first offended the other, then he would have nothing to say if Sethanda came to kill him. But now things were different, there was no enmity, yet his opponent was coming to kill him. Gu Shanhai naturally wouldn't let this slide, not just the opponent, but he would have to wipe out the opponent's entire family.
Surely he couldn't just allow them to kill him without fighting back?