The Wizard King summons Asta after his work dealing with the Eye of the Midnight Sun. Yami tells Asta he can come with him to the royal capital, since he has to go to a conference of all the Magic Knights Captains.
That just means he was able to use 
all of his strength to fight.
.هذا يعني أنّه تمكّن من استعمال كل قوّته للقتال
Das heißt, dass er entsprechend
viel Kraft eingesetzt hat.
Eso demuestra que te esforzaste mucho.
Eso demuestra que te esforzaste mucho.
Ça veut dire
qu’il a tout donné au combat.
Significa che ha sfruttato 
al massimo le sue forze in battaglia.
Isso só significa que conseguiu
usar todas as suas forças ao lutar.
Это говорит о том,
что бросил все силы на бой.