in monday when you walk to the priest on the street cant you kick him and when he pulls out a melee to hit out you jump and get a boost? i did this a couple times but couldnt get it to really work that well again

i was watching this video and at the bank section 4:50 i saw some sort of quick save/quickload glitch and i was wondering if somebody could explain this? thank youhttps://www.youtube.com/watch?v=IFUerydSwus?t=248

how do i get it so that everytime i restart the game the same preset will always be used? or do i have to restard everytime

i keep getting

Host_Error: Level transition ERROR

Can't find connection to d1_trainstation_03 from d1_trainstation_03

i have been doing everything as said in the tutorial i am using, im using the beginners hl2 old engine one by mirakapz97