That is the Gladiator Emote, which you get from Cyrodiil by collecting Arena Gladiator Proofs from the Conquest quest board. You get a good amount of proofs, and can buy (for now) a costume, a helmet, and that emote, with those proofs, kind of. You basically convert the proofs into a runebox with an item you buy with AP from a vendor, but if you've no proofs that item is useless to you.
Also you can buy it as runebox for gold in guild traders from other players.
The emote is different on the type of weapon you've equiped, so with sword and shield it looks like what you saw.
https://www.youtube.com/watch?v=xfqB2D202Nc
That is the Gladiator Emote, which you get from Cyrodiil by collecting Arena Gladiator Proofs from the Conquest quest board. You get a good amount of proofs, and can buy (for now) a costume, a helmet, and that emote, with those proofs, kind of. You basically convert the proofs into a runebox with an item you buy with AP from a vendor, but if you've no proofs that item is useless to you.
Also you can buy it as runebox for gold in guild traders from other players.
The emote is different on the type of weapon you've equiped, so with sword and shield it looks like what you saw.
https://www.youtube.com/watch?v=xfqB2D202Nc