[So usually after a ridiculous event like this, leaving him rattled and uncertain, getting lost in mindless training is usually right up Porthos' alley. That, and comparing more modern-day weaponry to the types of weapons he's more used to (finding those differences and similarities, how the newer things work, utterly fascinating).
But today finds Porthos rather... sad. The event's left him rattled for obvious reasons, but now that Robin's left, he's obviously not in the most cheerful of moods. He's attempting to train, to keep his mind off of things, but anyone who's used to his usual good mood will know that his heart is clearly not in it right now. Good thing he's abandoned trying to fight holo-Pearls for the moment, considering it'd likely end in disaster. He's training. Or randomly stopping and staring off into space, lost in his thoughts.
Eventually, he'll give up on training entirely and instead wander towards the weapons shop itself, surveying what's available. He can't exactly afford anything (yet), but it's maybe a futile attempt to keep his mind off of things.
Later on, he'll be wandering around elsewhere - most notably to Robin's usual places of interest - the museum, the library, her room - because he's a sentimental fool.]