Ok, let me give you a clear cut answer to this.
You guys either never read BSD or have no idea about NLH.
NLH as an ability is much complex ability than Dark Impulse. Dazai will just nullify Dark Impulse and when he does so, he will not receive any damage. Secondly,
Dazai will also restrain Mikey from doing any continual attacks for a few seconds, so that's a perfect time for Dazai to land attack. Secondly, Dazai has enough AP to stomp on Mikey's face or something like that. Considering how smart he is, he will surely repeatedly attack Mikey. Secondly, Mikey when he comes out of DI will have to grasp the situation as well. Dazai will easily overpower him in intelligence and this fight would end in like a minute lol.