Possible Clues:

• How to make new doors fail test of reliability
• Renege on a promise
• Go back on a promise
• Tear up agreement to interfere with unit for one of The Blades (5,3?1,4)
• Go back on holiday; willing to doze on the way back
• Go back on promise to destroy foil after switch to Spain (5,3'1,4)
• Don't do as promised and destroy a sword (5,3'1,4)
• 'Faith, you'll have none of it, in a manner of speaking (5,3'1,4)'
• It will ruin a single weapon, lying there like that (5, 3'1, 4)
• Smash the single weapon? Faith, you haven't to do it