What happened in today's episode isn't canon, although the whole point of using Hiraishin is to catch people off guard.
Look above. The only thing that happened in the manga was Tobirama using Hiraishingiri to kill him. There was no PS or Mokuton in the manga, nor was there a fight between Tobirama and Izuna.How is it not cannon? The only difference is Tobirama used a kunai while in the manga he used a sword or something.