Black has managed to consolidate his position and the king is safe on b8. A future plan is ...g7-g5 followed by ...Ne8-g7 and ...Bc8-d7-e8 in preparation for ...h7-h5
Preparing ...Kc6-b7 in order to safeguard the king, and at the same time protect the knight from the threat of 2 Qf5+.
Black "copied" the opponent's bishop manoeuvre, and with good reason. Now the a2-pawn is in danger.