Possible Clues:

• Henry in feast displaying menace
• Warning about that's sent round
• Engineers put in that warning
• Words from a blackmailer, collectively
• Taking in again that it's a hazard
• Danger — English leaving for that reason
• Aggressive declaration made by husband in dress?
• It's about in that promise of evil
• Such a promise is no good for the tar
• Indication of imminent evil