There might be two possibilities, first is Enzo really did spiked his drink based from their little "no drink, no question" thing, he suggested that so... Second is that the guy who clings Rian from the start did it. But it wouldn't make any sense because he knew Rian will be talking to someone before hanging with him.. unless he didn't think the drink will kickoff so soon. Based from enzo's expression it can also be mean two things, he was shocked from Rian's accusation or he was shocked cause how he would know that easily. And that alcohol.. was it opened prior giving it to them? Or the ice was the one was spiked? We didn't have a close up scene when enzo gave the drink. But enzo looking at Rian before drinking is sus.. am I overthinking too much? But hey I hope he won't force himself on Rian. I think the pacing is good enough.