On the 2nd diagram,the pawn on b5 is free for the taking because after Bxb5 axb5,
Nb5 chases the Blacks queen which has no good square to go to.
...Qc8 falls to the fork with Nd6+, ...Qb8 or Qd8 has to recapture the knight once Nd6+ due to mating net many which involve white brutal Bb6+.
The Brutal Mate seen in the first diagram is found in one variation when Black refusing to lose the queen by capturing the Nd6+.
and will eventually have to take the checking Knight on d6 to avoid mate in all variations.