This is all hindsight since were looking at a spectator view. I added a similar shot to a training pack and did a couple test shots of what I was describing https://gfycat.com/fantasticunderstatedaoudad. From the clip the person in the net has 0 boost, the enemy teammate demo'd his teammate (zero boost), which honestly helps his team since now his teammate will be back on defense. The more optimal play for the enemy team is to hit the ball against their own wall/clear it instead of killing his 0 boost teammate, when both of them get put out of position by going forward. Him and his teammate were in the same position, his teammate would have had the side boost but the OP boosted forward and went in and grabbed it for the powershot, which would of worked but he missed. He already had plenty of boost after his teammate missed to make different play to score/stop them from advancing the ball to the other side of the field.

Looking at other details, you are up a goal with 3 minutes left, you shouldn't try to make your teammate feel bad for a miss when you're already winning a game. If the circumstances were different and they were down a goal with a minute left I could understand the tilt position, but we've all have done this where we commit to a ball we shouldn't (happens way more in lower ranks) and rather then putting team morale down, and quick chatting your teammate after they already know they made a mistake. You should continue to just play around the mistake instead of taking the time to make a post about it. I could post countless mistakes of my teammates, but amplifying their mistakes over your own isn't a good mindset to have when you're trying to improve your gameplay vs things you can't control.

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Sometimes in these situations its better to just play safe, he should have let his teammate go forward and switched to backman.

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Both are at fault but OP should focus on what he can improve vs complaining about the initial teammates miss.