They Reply to the OT w/a link to their QT
Such a tweetbond basically serves as a contract that one will tweet with a minimal level of decency, that is, one will not get suspended, do mass tweet deletion, etc.
The tweetbond serves as a record.
One will see a missing Quoted Tweet but the link will be visible in Twitter Web Client if nothing else
The tweets might disappear. Links won't
One way around this would be for the original author's affirmation tweet to be the full 280 characters.
I suppose the API may have a workaround. Hmm.