There's a brief moment of invurnability after morde's ultimate ends. Is this intended?

9 12 PBE1 4309676627 01
Uploaded by MrVlekje5 on 2019-06-11.
So basically i believe that the instant mordekaisers ultimate ends he is immume to dmg. I've got a clip to illustrate my point. As you can see in the clip. My E dmg goes off yet my ultimate deals no dmg. It also goes off right on the instant i shift out of his ult. I also don't seem to take dmg from his Q but could also just be out of range there. Is this an intended mechanic?
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