Zarek had no idea how long he was out for. He would normally never make such a mistake—losing consciousness in the middle of enemy territory, when there was an obvious path right to where he was at this moment, was nothing short of a death sentence.
Even if he hadn't noticed them check on his and Crux's battle, that didn't mean they didn't have a method of doing so. For all he knew, they knew the instant he killed Crux and had already been on their way.
The only reason he diverted his attention to the statue at all was because he felt something odd from it. He didn't believe it was a coincidence that there was a great amount of pressure coming from it… and just maybe, it also wasn't a coincidence that the Elixir was the key to breaking through that wall of energy as well.