And if I’m not mistaken I am pretty sure while it has concentration on witch bolt they will cast something else like sleep or whatever and it will still have concentration on witchbolt. Pretty sure the rules is if you cast another spell you lose it.
A beam of crackling, blue energy lances out toward a creature within range, forming a sustained arc of lightning between you and the target. Make a ranged spell attack against that creature. On a hit, the target takes 1d12 lightning damage, and on each of your turns for the duration, you can use your action to deal 1d12 lightning damage to the target automatically.
The spell ends if you use your action to do anything else. The spell also ends if the target is ever outside the spell’s range or if it has total cover from you.
You are right indeed.
However, Larian also use Fire bolt to set ppl on fire. And this is ALSO erroneous. They just dont understand the mechanics of anything relating to 5e. They are adding the flavour of D&D to DOS:2.Its shaping up to be a big ass mod, with tidbit of both games. Making it not either of them, and ultimately, a less enjoyable experience.