This performance serves as another significant moment in Rashford's Spanish adventure. Having already drawn praise from club legends like Gerard Pique for his surprisingly quick adaptation, the 28-year-old is fast becoming a vital weapon for Flick.
Initially viewed as a luxury depth signing, Rashford is making a compelling case for a permanent starting berth. His unique profile gives Barcelona a "Plan B" that effectively rescued them on Tuesday. Whether starting or coming off the bench to exploit tired legs, he is proving to be a difference-maker on the biggest stage.
The comeback victory puts Barcelona in a commanding position in the Champions League group table, taking a significant step towards automatic qualification for the round of 16, though they will still need to climb into the top eight over their last two matches of the round if they are to avoid the knockout play-off.
For Rashford, the focus will now turn to the weekend's La Liga action. With his impact from the bench undeniable, the question for Flick will be whether to unleash him from the start against Osauna, or continue to use him as the ultimate impact sub against tiring defences.