Also, since we are talking about ninja there are some other interesting tidbits of interesting information about them.Yup, and the Hattori line is also kind of jumbled up iirc, sometimes you see the most famous Hanzo's name be Masashige and sometimes it's Masanari, though I think it's more likely that it's the former because Masanari was his son and it's not common for sons to have the same name as the father. Hanzo the Demon was the second Hanzo, there are a few clans which had the head assume a shared name when they become the head of the family. The other most famous example is the shared name Kojuro for the Katakura clan head, though nowadays when it's mentioned it's always in order to refer to the most famous head of the family, Katakura Kagetsuna, who was the strategist and loyal retainer of Date Masamune and his father Terumune, but most of his famous exploits come from serving Masamune. He is often nicknamed Kojuro the Wise to differentiate from his son Shigenaga, the second Kojuro, who is famously known as Kojuro the Demon.
The common belief that Ninja were so dexterous and fast that they could catch a sword with their bare hands was a myth that was probably propagated due to their use of climbing claws. Many ninja that carried out infiltration missions carried these tools in order to climb castle walls or houses and in combat, since these tools prevented them from using a sword, they used them to their advantage in order to disarm their opponent with ease. This practise created the myth among the samurai that Ninjas trained in such a rigorous way that they could catch a sword with their bare hands and not get hurt.
As well, there is the common belief that they would banish in plain sight. This was due to a hilarious cultural factor in Japan. In kabuki theatre, there were men in charge of changing stage props during the act that were dressed in a specific way. The people of japan were already conditioned to outright ignore these people by their easily recognizable attire, making them technically invisible. This was another practise that ninjas took up and used to their advantage and sometimes when they needed to avoid detection, aside from disguising themselves as farmers, travellers or courtesans, they would use this trick to be "invisible" to their enemies.