Courage: Power +2
When played first in the round, Power is increased by 2. If played second in the round, their Power is equal to the amount shown on the card.
Can someone explain, why my opponent gets it in the third round too? It's unfair and annoying, especially in ELO. It's not the first time that happened...
Courage abilities are activated if the card with this ability is chosen first rather than second versus your opponent's card(s).
Your turn first: You use Emma (courage: Atk + 12) then you wait for your opponent to pick his/her card. This will activate this ability.
If your opponent is the first person to pick a card and they use a card with courage ability, and then wait for you to pick yours. Then this will activate their card's ability.
It doesn't matter if it is your first round or 3rd round in the battle itself.
I guess the explanation above for courage ability is not as straight forward.
When they say "first in the round" and "second in the round" they are referring to whether the card is picked first against your opponent's card. It is not referring to the set of rounds in your battle. I guess that's the best explanation I can provide to you.
Hope that helps.