You can cast Swift End, the Adventure instant part, in this case. Adventure doesn't only work from the hand. If what allows you to cast the card from an unusual zone has no special provisions on casting it as an instant spell, you can. If it resolves, it will end up exiled with you being able to cast Murderous Rider from there, just as if you cast it from your hand.
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I'm a former judge (lapsed), who keeps up to date on rules and policy. Keep in mind that judges' answers aren't necessarily more valid than those of people who aren't judges; what matters is we can quote the rules to back up our answers. When in doubt, ask for such quotes.
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theatre of horrors + adventure