OK, you make your roll for DAS you roll poorly and are convinced you're not going to hit with an Attack Stratagem or succeed in a meaningful Skill Stratagem.
So, can you decide to opt not to use DAS this round and instead eg. make 3 melee attacks. So, your 1st melee attack will be at your full attack bonus.
or having opted not to use DAS your next attack is at -5?