This ain't rocket science.
Kelsey and Megan was drunk as fukk and scrappin
Kelsey got the gun
Tory tried to get it from her and during the struggle the gun went off multiple times
Megan got hit in the foot with bullet fragments
The rest of it is fukkery, lying, and backstabbing and that's why we're here now.
If I were to speculate, Roc Nation wanted to protect their asset, figured Tory Lanez is expendable, and concocted the "TORY SHOT ME!" narrative.
The truth about Megan being a fake, backstabbing friend that consistently snaked her BFF over dudes would not sit well with Megan's young, primarily female audience.
In order to preserve her image and career, Roc Nation convinced Megan that this was the best way to go.
If Tory just raged out and shot at Megan feet, Tory would already be in jail.
LAPD tried to OJ this one and the result is the same.