Yeah, that's exactly what I thought: this moment will be believable when we see Ghost is leaping and killing people trying to attack Jon.

Julius Caesar going to Britain was the main (truthful) charge that his enemies in the Roman Senate were going to use against him as soon as he returned to Rome, without his army, as not a Consul or Pro-Consul (which legally protected office-holders from being prosecuted in office).
Caesar largely "crossed the Rubicon"…