<strong>Laughing Hyena:</strong>You cannot dash, attack, and disengage in a single turn. As Dash takes an action, attacking is an action (you get a move, action, bonus, and reaction as actions once per given turn and reaction can happen during the foe's turn once between your turns). As a rogue, you can as a bonus action hide, disengage, or dash. The only difference between a dash and normal movement is really that Dash is an action and movement is a move action (so you can move and dash the same turn to move 60'ft most creatures).<br/><br/>So I advise you spend movement get close to Buga (no opportunity attack entering threatened square as leaving threatened square gives provocation). Then attack then use a bonus action to disengage (leave without provoking opportunity).<br/><br/>As noted Buga has AC 18, so your attack did not land. But as earlier mentioned Buga may get blinded and grant advantage to your attacks (which I roll for you if it happens).