Skraal had his own reasons to give Death Origin to dragon he had summoned. There are several reasons for him to do these things as it would be the only way to gather some of the attention on the Dragon. Skraal for the time being started understanding the difference between Origins.
These four creatures all at the same level as himself and they are all origin users with one important and clear difference. The origins they have not that complicated origins. Skraal for the time being only saw and witnessed origin of two of them and understood that these two were the weakest link most likely. The leader of them the creature who have spoken with himself did nothing until now at all.
Considering all the things and other materials as well as many other fighting mindset. Skraal can understand these things without any problem whatsoever.
These things are no joke and can be easily understood without any problem at all.