I smile a little and nod. "When the mare took off her bracelet the guard's cuff told them an illusion was nearby, that's when I realized what the mare's bracelets did. But it caused me to panic, if the guard started looking around for an illusion the ponies following us could notice a guard investigating. So I panicked and just cast the simplest illusion spell I knew and talked about it louder than I needed to so the guard would hopefully overhear me."