Leyline of Combustion and Ricochet Trap
Hi,
Thanks for your question. Yes, the Leyline will trigger, since Nick is becoming targeted by Andy's spell. It doesn't matter that they control the source that's changing the target, or that it wasn't cast targeting them, the Visions wasn't targeting Nick, but now it is (and the Visions is still controlled by Andy) so the Leyline will trigger.
Thanks,
Nathan Long
Magic Rules NetRep