I understood how this bug works, and tested it today. I heard about it from 1 person who want to remain anonymous.
This is how it work
You need to start talk with NPC who block way. wait end of message, crahs internet (simply unplug ethernt wire) and press log out. After this was done - fix internet , log in and spamm up or down arrow. You will skip this kind of NPC.
For NPC who battle you, crashing internet is not needed. It's enough to just log out, and log in + spamm arrow (left / right/ up down) doesn't matter.