Is this a bug?

[Amos]

An assassin in independent province is summoned to arena. But instead of going to arena in the next turn he is attacked and killed by indies.

[Johan K]

This is because "compete in arena" is not a stealth command so any sneaker using it will be found automatically.

[Gandalf Parker]

So basically he "unstealths" to go and gets attacked?
(stealth check happens first)

[Amos]

So if my assassin has trident he is basically screwed .

[Arralen]

Just make sure he doesn't get the trident

[Cainehill]

Or don't send him into enemy territory unless/until you think he can take an army.

I do think it's screwy that he'd unstealth - commanders are getting teleported to an arena from all over the world, aquatic commanders can walk on ground and breath air, and yet a stealthy commander has to come out in the open and wave to enemy armies?