Who's fault is it?

So today me and my partner had a friendly match, we were quite stable and kept pinning our opponents backwards. But when our opponents decided to push us back, we got rekt because of our poor defence. Im an ex-tennis, i still struggle with the walls (especially when the ball is coming at me at a very high speed), so i just try to block the ball and hope for the best. Sometimes it works flawlessly, sometimes it doesnt. My partner on the other hand uses a very "predictable" strategy... he keeps rallying with one of the opponents back and forth, allowing them to analyse our position and catch us off guard. And when they push hard on us, i try to reset the rally with a really high lob landing just right in front of the glass. But my partner just straight up hands them the point with a poor lob, allowing them to whack the ball at me. A ball like that is literally impossible for me to counter-attack it or even block it, yet my partner yells at me for not "letting it bounce off the wall" and counter-attack it. We already lost the point before they even touched the ball. So who's fault is it? My partner's predictable strategy and poor lob or my bad skills with the wall?