Contempt was not equivalent to belittling. The fact that the enemy could destroy the flying puppet swiftly, and locate the exact position of the camp, meant that there was at least a holy master who was equivalent to a grade-6 mage present. Since there were so many blood knights, there had to be a huge number of low grade holy masters too.
Lex was lucky. The Tanggulasi army had discovered her tracks very late, so even though they traveled quickly, they were still afraid of letting her get away. Consequently, they deployed the blood knights, who traveled the fastest, to harass her. It was not a planned operation. If there were holy masters among the blood knights, the blood knights would not have been obstructed by the magic traps and fell off their warhorses so easily.