There were no changes to Sean's battling style. But it was that barbaric fighting method that gave off such a terrifying impact under the influence of the green-colored combat energy. In a single exchange, Sean struck Sandro heavily with strength like that of a magical beast.
Sandro was experienced as well. Once he noticed that he could not win against his opponent with strength, he started to tussle with Sean. To him, his opponent would not be as agile as himself. Furthermore, that great sword of his would put Sean at a disadvantage as it was better at attacking, and not defending.
If he could secure one opportunity, Sandro had confidence to defeat his opponent.
To be honest, that was indeed a valid strategy.