Taking an ally Forge's tile

I found something when doing Conquest's "Le Maudit" map (the one where you need to kill Valdemar), I took the raven's tile with his forge, and there was his relic being built at 66%. I removed the relic from the queue and got the resources from the craft (100 krown, 50 wood and 10 iron)... If it works in any map and especially in pvp, I dunno how that trade could break stuff... But it shouldn't happen since you're supposed to have your own queue. (I was playing Boar, didn't try to finish the relic's build, dunno if I would have got it or not, I just removed it from queue and destroyed the building)