Life in Rewind,
I think it's great you found a way to grab a feed that sounded great, that's why we all tape.
Until your last replies, you didn't mention any of the specifics of the room, the band, the engineer, the PA, or any details about the situation... so it's only natural for others to point out that even though all of the above conditions were exactly as you explained them in your situation, that it would not be advised for other tapers to try this. Not to mention, unless a taper understands exactly what they are doing/patching....it could be problematic for the sound/band. Also, being the "senior taper" as you described yourself, you should have a set of splitters for your bag so that both you and the "newbie taper" could get a patch. Sounds like the newbie beat you to the board. jk.
Again, glad you made a great tape but I think it's important to point out for others wanting to try this, that it is in fact, a less than ideal solution and there are at least 3 other methods (mentioned here already) that would work a lot better. YMMV