Possible Clues:

• Mouth-to-mouth resuscitation
• Artificial respiration
• Presumably, He was expecting the complete opposite from Judas as this might save one's skin
• Repeated blows to bring people round, paradoxically?
• Blows used as form of first aid
• Act of resuscitation
• Is thrilled with old skiffle's revival!
• First aid treatment
• Emergency resuscitation
• Not something you'd expect from Judas, as it might save one's skin