colossus slows enemy movement around you, that's why it's good for melee heroes. additionally, melee cancelling has had many changes and reworks and used to be much more powerful as a movement tech. there was a time when it was removed completely but it was added back because people liked having it.
when you use doorman ult on someone, it shows that they'll return to where they were when you cast it. however, if they were already doing an action that moves them (infernus flame dash) their return point will be shown the same but they will return to where they were after the return point was...
In this screenshot I'm not holding alt or tab to expand the UI. this happens upon respawn sometimes and can only be fixed by spectating someone while I'm dead, opening the shop, and mashing alt or tab until it goes away.
