Straight from the start, Ivy was the first to engage in combat. It was unclear whether he was underestimating Alex or not but he seemed to stay true to how he always fought prior to Alex's arrival.
With his shortsword in hand, he and Alex clashed in the centre of the arena. This was a common thing in every fight to gauge the strength of your opponent before you truly revealed your actual skill level. If your opponent couldn't handle you of the bat, you knew they simply weren't your opponent.
Ivy didn't really have any expectations for Alex, instead, he was simply fighting to win, like he always did and to improve his own skills in PvP. Yet when Alex didn't falter under his sword, despite being of the assassin class, it was safe to say he had garnered his attention.