Why is my monster teleporter not working?

[Betelgeuse]

I made it so that the player needs to shoot a switch and then it lowers  a sector with a key and it also lowers a sector in the moster closet so that the monster can move in the sector via the "scroll move things according to line vector", but there is just one issue, the monsters are not teleporting, they are moving through the linedefs that teleport them to the main area.

 

 

[Kan3]

Flip the teleport trigger lines to face the other side (look at the tiny middle segment, it needs to face the monster) by pressing F 

[realjohnmadden]

Your teleport linedefs seem to be facing the wrong way. Use F to flip them (they should be facing the actual monsters - see the little middle segment that every linedef has). Things in Doom will only trigger a linedef if they hit the side of the linedef that faces them.

 

Here's a quick reference (pay attention to the orientation of the linedef, noted by the middle segment):

[Betelgeuse]

Thanks guys, that worked.