The Blade of Mind didn't trigger the immunity effect, indicating that this ability doesn't count as compulsory spirit type control. After exploration in battle, Su Xiao found that the abilities immune to the Blade of Mind are mostly strong control spirit type abilities, like compulsory charming and spiritual dizziness.
The influence he is under now can be at most considered as a kind of misleading that amplifies emotions. The reason it affects Su Xiao's judgment is because several emotions are being amplified simultaneously.
If only a single emotion were amplified, with Su Xiao's willpower, he could completely suppress such emotions. For example, when he saw that female student before, although his thought at the time was to pin her down and grind her, he didn't act, instead restraining his own desire with willpower.
Identifying the problem, Su Xiao breathed a sigh of relief. This emotion-influencing ability is strong in its stealth; once discovered, it poses no great threat.
