Possible Clues:

• Totally shaken
• Turkish commander's time to be shocked
• Appalled to see a 'phantom' spelled with 'a' instead of 'o'
• Horrified commander goes down with small stone
• Stupefied with horrer
• Shocked to see a staghound largely out of control
• Shocked, dumbfounded
• Fear-stricken
• Struck with horror
• Horrified, in a way, by frightful hag