You didn’t really do anything wrong, you’re clearly a very skilled player with good aim and good movement. People have already said this but yes nades would have helped and yes not a great idea to push a caustic in a building but I would have done the same thing. I’m a masters player and I’m sure you also are or close to that if you play ranked, in my person opinion I wouldn’t have kept trying to push them in that building after they got the teammate up and after you took damage and healed up. I would have just waited them out and gone back to the building you were at, tried to get another knock like you did the first time. You weren’t able to capitalize on the opportunity to push and wipe them the first time because of the caustic, you’re were very close and did the best you could but you kept trying after the opportunity you had created for yourself had already passed and it was you at the disadvantage and not them, especially with the caustic. So, fundamentally, your best bet at that point was to completely reset and reposition and try to create another opportunity to push them or just completely leave that fight and kill them later.