Well, the thrumble she killed had been bullying her since she hatched
Oh frick I forgot that Scalene has a face scar from the thrumble
The thrumble was actually strangling her after Scalene found out that Mewza's real name was Echo. He took advantage of Scalene's sorrow
Scalene fought back and killed him
The drawing is right before Scalene meets Mewza. Scalene has a special place and she finds Mewza there