I went into Clash against a team of 6 who were in a party. Most of them were lagging, so I assumed that they were foreign players being matched to US players by getting a US host.
[spoiler]http://imgur.com/BEeiyxj[/spoiler]
Now I know this is unavoidable, but it is extremely annoying. Let me know if you have ever experienced something like this.
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A more likely scenario it that they were streaming. I've played with plenty of people from outside the US, and not had lag issues.