Three things that are guaranteed in life, death, taxes and the Bruins second line 🔒 The trio of Viktor Arvidsson, Pavel Zacha and Casey Mittelstadt has been one of the NHL’s best offensive lines this season with 29 goals for (3rd), 4.26 goals for/60 min (2nd) 👀 Did you expect this from these three when they combined in October? 🤔 #NHL #Hockey #Bruins #Boston #NHLBruins #ViktorArvidsson #PavelZacha #CaseyMittelstadt