To be caught in the middle of the Vongola manor was a bit of a difficult thing. While they hadn't planned to move yet, Osmio knew there was trouble if he had to talk to the leader. Hyperintution is a pain in the ass. Though, it was the thing he had danced around so long.
But eventually that was bound to fail, when he didn't answer a direct question, or at least not right away. One there was too quick to attack, Mercurio reacted quicker, and he had to move that instant. He just wished his sister wasn't caught with him at the same time, even if she reacted poorly, it's the other side who started it. They'll escape, and begin their plan.
After all they don't know much about his plan, and he knows Tsunayoshi would rather try to talk him down if he hasn't successfully hurt anyone he cares about. Their long standing 'friendship' on his end would service this. He doesn't want to go as far as he will, but it has to happen for his ideals.
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She had thought this would go as another normal meeting, and then Tsuna had asked a simple question. But a pointed one. They had danced around the reason they had gotten scars. But finally trapping Osmio by asking who gave them to him, she could see him bristle. She knew Osmio would be honest, likely apologize and explain that he simply made a mistake in one of his experiments and that he didn't want Tsuna to know. It's honest enough even if it's not fully accurate as to why he was doing those experiments. But that momentary tenseness in an already tense conversation, meant something had to break. It was as if someone vaguely knew something, but in the time, she couldn't see who acted other than they had immediately launched flame. Maybe she shouldn't have acted so quickly back and they wouldn't be in this situation. Not helped by the grunts that heard the commotion and are trying to join the fray. She just prays they can get back safe.
