Syrian military and ISIS have been ‘ignoring’ each other on the battlefield

"These figures suggest that the Islamic State and Assad’s security forces have embraced the clever strategy of ignoring each other while focusing on attacking more moderate opposition groups.
Assad is trying to downplay the Syrian revolution narrative and instead portray it as an Islamist insurgency against his government. This way, he can crack down on it with the indirect support of the West.
The Islamic State is looking to engineer a scenario where it is just them against Assad. Therefore, right now the group’s focus in on marginalising moderate groups to the point where these groups’ fighters are ‘asked’ to join the Islamic State.
The lose-lose situation that the West could be heading for is the Islamic State vs Assad.”