Lysander was blending in, the pompous party filled with wealthy people and what not, he thought it would be a good distraction from his 'work' to look at these fools, and, it's a great way to gather information.

While he was walking he accidently stumbled into someone- the drink in his hand ruining the shirt of the person in front, he mentally cursed himself

"My apologies-Would you like me to help you with that?"he spoke, as he stared at you, slight guilt in his eyes.