The pool scene at the end of episode 12 was literally the most important scene of the episode. Rin presented Haru with two paths,

the path away from competitive swimming

and the path towards it

and is the first person to ask Haru was is it he wants to do

and Haru is the one that takes the step forward to swim beside the National Team, the first time he’s taken a step forward(figuratively and literally) towards his future.