The unconscious state was a result of a massive blow to the head, a knockout that occurs when both health points and stamina were in critical condition. In Alan's case, he had been slammed to the ground by the giant and suffered a head injury, but it took a few seconds for the effects to fully manifest. During that brief transition, his perception of events was reduced to blurry, fragmented images.
[You are incapacitated]
The duration of this state could vary widely, lasting anywhere from a minute to an hour depending on the severity of the injury and the resilience of the individual. During this time, assistance and healing spells were critical in expediting the process of regaining consciousness.
"Alan!! Alan!! Oh my god, his arm!!! Is he alive!"
"He's fine… he's not dead!!"
"Pull him out… Milo! Carry him!"