Yes I do understand.
You are not the one who understands. It plainly says go and buy a sword ( not spiritual ), and the disciples said look here are two swords, and He said it is enough.
This is not spiritual swords, or the word of God being talked about here. They were actual swords.
He did not alter or change what He said.
He told them to go buy some as if nobody had one, when they saw that they had two already Jesus said that would be enough. There was no need to go get more because they had enough for the situation at hand.
No, Jesus said he that does not have one is to go out and buy one. This applied to ALL of them who did not have a sword. That's what He said. You can't erase Jesus' words just because they do not sound good to you. They clearly misunderstood him like they did many times before. So seeing they misunderstood Him, like He was expecting them to, He said it was enough for the situation to teach them a lesson NOT TO USE THE SWORD. Unless of course you believe Jesus was praising Peter in his use of the sword.