Any formation worked only when its nodes were connected. This was the fundamental principle of the Arrays and Formations. Logically speaking, Samar's Enchantment should've also affected the third and titular Set Effect, the Sentinel Array.
However, the Sentinel Array was not a basic formation but a complex one!
"While each piece of equipment in the Sentinel Set acts as a node to activate the first two Set Effects, a complete Sentinel Set is a node in the Sentinel Array!" Samar came to a realization, and his eyes glinted with manic light.
The moment this thought occurred to Samar, he started to act upon it. He gathered the sixty pieces of the 10 Leather Sentinel Sets and started to carve Runes of each and every one of them.
Only after he had carved the Wind Rune on each and every piece did he begin invocation. His ambitious plan was to invoke the runes on all sixty pieces of the Set at the same time!