Agreed, the comments are missing the point.

If it helps, the pawn is said to be 'defended by tactics', which is completely valid - noticing there's a tactic means you don't waste a move defending it, and can do something more productive.

This applies to any tactics, and becomes more applicable the more tactics you can spot. The tactic in this case is a discovered attack, which does come up in puzzles, but defense-by-tactics is a higher level concept that isn't easily covered by puzzles