While we are talking about Slave Master, there is an issue with how map is cleared.
I played with... cant remember who sorry... and I stayed defending bottom part. My partner went up, took 2 orbs on the easter part and went to clean north east including Slave master but slaves couldnt be free'd at that time. Then he went on cleaning north west, free'd slaves, brought them into teleport, no problems there. And then he went to free other slaves on north east, but he couldnt do that coz when you hover your mouse over the slave cages to attack them, your units should destroy cages. But that was not the case, he couldnt select cages to attack, instead cursor didnt change into attack and he could only move units around.
I havent tried to replicate this as of yet... feel free to do this. 😃