Possible Clues:

• Having an abnormal reaction to something
• Kind of reaction
• Hypersensitive
• That'll have something to do with the reaction to grill ace criminal
• Breaking out, maybe
• Very sensitive
• Visitor loses the head with soldier getting caught - what sort of a reaction would you expect?
• Hypersensitive to something
• Having hay fever, say
• Hypersensitive (to certain substances)