Ty was worried by Alex.
Quickly rushing to his locker Ty got out a slip of paper and wished for the reason his powers hadn't worked on Alex. The answer that he got was " he is too mentally powerful".
Ty was worried by this so he tried to think of a way around it and he got an idea.
"I wish that whenever someone is too mentally strong psyche wishes will not affect them until my powers will find a way to get into their their minds which they will start doing now."
Ty decides that it is good enough for now and he can always change it later.
Lastly he made Alex catch a cold and sent him home early to keep him from being a problem for now.
Ty then thought 'Now let's drive Dustin crazy with lust and do some stuff to other people too, after waiting 15 minutes for Alex to leave.