Owners of traps lose homeguard+mobility boot speed from across the map
So this applies to anyone with traps. Cait/Nid/Shaco/Teemo.
If a trap is set off from across the map while the owner of it is using homeguard or mobility boots, it causes them to lose their speed.
I was watching someone's stream in a high teir game. A Nid was being chased but she had Mobil boots and was easily going to get away. The streamer saw a trap on the ground in a different lane and deliberately set it off so his team could catch her and She ended up dieing. It was an amazing play and reaction from the streamer but this seems a little messed up.
I think that if you are an X amount of distance away from the trap you shouldn't be effected by this.
(I can feel your hate)