[dragonwriter]

No, in general, a threat of legal action might, if you want to take things to extremes, be a threat that, if you don't comply, the actor will attempt to secure an authorization from a third party (the judiciary) that would impose conditions under threat of violence, but it is not, in itself, a threat of violence, even delayed violence.

[Lawtonfogle]

You cannot outright ignore the threat because there is a chance it could escalate. Any example you give, I could give a counter where I use some non-state certified violence (such as the mafia) that escalates in the same fashion, and it would be considered a threat backed by violence.