Sacrificing the creature is part of paying the cost of Flashing back Cabal Therapy. Triggers can't be put on the stack while a spell is being cast, so Cabal Therapy will be put on the stack, and then Veteran Explorer's trigger will be put on the stack above it. The Explorer's trigger will therefore resolve first.
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DCI Level 2 Judge
If your question is "What would a judge do is this situation?", only one person's answer is relevant, and that is the Head Judge at your event. I can quote the rules, but I don't know your HJ.
When you sacrifice Veteran Explorer to flashback Cabal Therapy, how does everything resolve?
I seem to think the Explorer trigger would go on the stack first, then Therapy, but maybe I'm wrong.
Any help is appreciated.
http://forums.mtgsalvation.com/showthread.php?t=292409
If your question is "What would a judge do is this situation?", only one person's answer is relevant, and that is the Head Judge at your event. I can quote the rules, but I don't know your HJ.
http://forums.mtgsalvation.com/showthread.php?t=292409