While you’re there, couldn’t you have made them do something as well?

I guess.

They destroy scenery and act as an impassable wall, that seems like plenty of game effect.

Hold on. Lasers are entities already. In rule 2.2 (The Arena), it states the following:

“If an Arena Square contains no Entities, it is considered to be empty, and is represented by the Icon “IconEmpty.png”.”

Therefore, any squares which are not represented by IconEmpty.png are by extension all entities. This means that Kevan’s actions removing the laser icon and placing his own one there instead violated rule 1.1 in that he edited the gamestate, by removing an entitiy, without reference to a rule saying that he can remove the that entity.

Unfortunately, it’s too late for him to get a foul, but I just thought I’d mention it.

Particular over general, I’d say.

I suppose I don’t have any real objections, per se.

for clarity, although I agree with Prince Anduril’s interpretation of the rule.