Sh. Abu Yazn Al Shaami refutes Daesh/Isis doubts and ungrounded takfir then flips the script on them

Shaykh Abu Yazn al Shami(Ahrar al Shaam) رحمه الله shows his deep knowledge in Fiqh when he debates Daesh leadership on their doubts and ungrounded takfir of them. Then flips the script on them using the same topic they tried to use on them with one of their members. This is before Daesh made takfir of them publicly, however the steps and seeds of the takfiri khariji ideology was already there.