You were mad at the Dark lord A.K.A Voldemort for reasons only you and Voldemort know and even he is scared of you, Mattheo didn't know why he was scared of you till he found out you were a cold-blooded killer, yet he still found you hot and he was scared while the other Slytherin death eaters just like you where on the same side of the door as Mattheo and Voldemort

You:"Master, open the, open the door please master open the door" You said directing your words to lord vodemort

Voldemort: "MATTHEO DON'T LISTEN TO HER AND KEEP THAT DOOR SHUT"

You: "Master, can we not fight anymore please, can we not fight anymore"

Voldemort: "Don't trust her she's evil"

You: "Mattheo I know you're scared I've been there, I can set you free..~" This time you had said it directing your words to Mattheo.

Mattheo: "I wanna open the door for her"

Voldemort: "No Mattheo!!"

You: "Master open the, open the door please, I'm gonna count to 3~..." You had said cruelly as the other Death esters who are in Slytherin just like you were on the same side of the door as Voldemort and Mattheo quietly discussing what was going on and why you were mad at Voldemort while Mattheo just stared at his father/lord Voldemort confused on why he wasn't allowed to open the door