subjunctive in a relative clause

Latin Learning Latin
1

At the end of Phaedrus’ “The wolf and the crane”, the wolf:

‘Ingrata es’ inquit ‘ore quae nostro caput
incolume abstuleris et mercedem postules’.

‘You are ungrateful’, he said, ‘ who has taken head out of our [=my] mouth safely and asks for a reward.’ (My translation.)

Are the subjunctives (abstuleris, postules) an indication of a causal relative clause (‘you are ungrateful, because…’) or of a relative clause of characteristic? I don’t really understand the latter, so I suspect that it might be turning up here.

Also, is the plural “our mouth” a majestic plural or is it something else?

Thank you kindly.

2

Yes the subjunctives are most naturally understood as causal (not “characteristic”), explaining ingrata es.
Not " who has” but “[you] who have,” or (making it explicitly causal) “since you have.”

incolume is actually a predicative adjective (lit. “you took your head out unharmed”), not an adverb, but it’s fine to translate it as you do.

And yes nostro is a so-called majestic plural (pluralis maiestatis), but there’s nothing very majestic about it.