It is still not clear what could have happened to the guard and why he wasn't attended to, but some persons gave reasons or should I say "their thoughts"... read one below:
"Firstly, when a Soldier passes out in formation, you do not break rank. The person in charge of the formation never gave the orders for you to move.Quite interesting and ridiculous too... more pics below:
The reason no one is helping him is because there is a medic at the back of the formation that will provide medical support.
Lastly, causes of Soldiers passing out in formation are locking of knees (leads to loss of blood flow, hence the vertigo), exhaustion (the practice for this short 2-3 hours ceremony started a few months ago come rain or sunshine), and illness. I will take my bet on the first being the issue here."