The mock battle took more pages than expected; they didn't give up after he used flash step. In any case, it was a convincing showcase of his abilities.
And, it also served to reveal his identity as "Fortress". It seems that he'll be temporarily joining yet another party. Well, actually, from what the leader of Steel wing is saying, they'll be joining up with Flame blade too to take down the Woods Eater. So they'll be 9 at least, probably more if they've recruited more people. It should be fun though he'll have to be careful to avoid revealing his abilities (mostly game and daywalker) since he's teaming up with lots of people he doesn't personally know. It seems they're respectable adventurers though. If the other adventurer is retiring, I wonder if maybe the girl, Ilia, will end up joining him on his adventures afterwards. She was in the dungeon by herself so I take it that they sometimes train on their own even if they're a party and that she might be inclined to join a different party afterwards while the remnants of Flame blade and Steel wing party up maybe.
But before that, next chapter we'll see how he does getting the drunken dream fruit. Looking forward to more!