A friend of mine told me that in melee a player can be attacked only once per challenge type. For example if someone attacked me in an Intrigue challenge, the other 2 opponents cannot attack me with an intrigue challenge, because I have been just challenged in Intrigue. The same for the other 2 types of challenge.
Is that true? I ask because I cannot find nothing on the rules of the Core Set...
And if this is true, I think this restriction doesn't apply to Epic Battles card.