@bvdaf It really is dumb, the MC knew he would die but decided to die to save an old man? apparently his sister and his own life dont matter. Then since the MC and the old man knew the future, even blocking the door the answer was simple. MC runs through first, blocks the door the same as he did, and tells the other to get through it in 30 seconds and to NOT run too fast. He said he could only hold it for 20 seconds, but he held it for more then that, roughly 30 seconds at least. Of course there is also the sled idea... but basically this author is trash, hes making situations with solutions and then the characters just dont think of the obvious solutions...
I was really hoping this would be a good story but i havnt been let down this bad by plot holes in a long time. its hard to believe that the author couldnt have spent just a bit more effort to figure out this situation for the characters. A better solution would have been "everyone can make it except the old man and woman, so the strong guy carries the old woman and the old man says he can make it but trips and dies as expected, the MC knowing this but knowing it was the only way to save the guys wife" That to me would have been far better and still resulted in the old guy being killed like the 'author' wanted. How can someone put out such trash when i was able to write a better scene in 10 seconds? i really cant even consider this guy an "author"... His writing is just that bad. They should have fixed it before the made this into a webtoon.