why doesn't the Ui say its too far... really?
the white line on the ground wasn't a clear enough "its too far" for that person so Larian should now redesign the game when its already falling apart from untested changes being kicked out to meet a bullshit deadline
the player is using a hack to play muliplayer on a single player system,
they ignored the white line showing them the range of their selected spell
they didn't spend a point to increase the spells range so it would reach and they didn't move within range or pick another spell
and at the end of the day Larian said, "you know what, a player is always right so let him waist his turn... perhaps he has a role play reason to toss it or is just not thinking"