Didn't work for me without the backup pet (Anubisath Idol), Harpy Youngling is H/B, Qiraji Guardling P/P breed which might be the reason(s). Old Blue had about half HP left when the Guardling went down. However Idol made it easy from there. Thank you.
I used Anubisath Idol (1 1 2), Qiraji Guardling (1 2 1), and Winter's Little Helper (2 1 2). Never got to my third pet because the vulnerability from Reckless Strike ended up lining up with turns when Old Blue didn't use damage abilities against me. Not sure if that's standard or just good RNG, but it worked!
Hello :) This worked very good for me.
But I used Flyby after the second Lift-off (because of the damage increase) and one Slicing Wind. My Harpy Youngling succeed to kill Murray.
Note: I have done this just one time and it is probably luck.
I'm glad it worked for you! There's no harm in adding/changing turns; it's always fun when someone can help you refine a strat. Murray is just one of those pets that doesn't always do the same move-set, so I tend to err on the side of caution when it comes to the moves.