My seat came off in x440, i need help ASAP

https://preview.redd.it/k2wpqv5gs38e1.jpg?width=4128&format=pjpg&auto=webp&s=f9bf66e0ecbe64918f021f89af517d9fd33326b3 https://preview.redd.it/k5xbzt5gs38e1.jpg?width=4128&format=pjpg&auto=webp&s=ccbba0e46820597a07056ab411af2710746b40c4 https://preview.redd.it/lpa9pn8gs38e1.jpg?width=3096&format=pjpg&auto=webp&s=246b60f10915eff80403ed866e7743ff202b7811 https://preview.redd.it/y6f2so8gs38e1.jpg?width=4128&format=pjpg&auto=webp&s=040f213cc1ba2a44ae5bde6458c3d48a0ca2e452 I was riding like 40-50 kmph and went into a medium sized pothole, not big. I noticed that the seat felt loose and that's when I realized that the seat had come off. It was not even an accident, apart from the seat coming off the bike is all good and I am all good. Any reasons for why this happened? Also do I have to go to the showroom to get it fixed or just a local mechanic will work? Is it something to be worried about?