There's a clause in Tesla's debt that if the share price is >$360, they can pay their bond notes with stock shares. If it is <$360, they have to pay their debt payments in cash. This obviously has a massive impact on Tesla's already precarious cash position.

Public companies can raise money through "secondary" offerings of stock. That's why an IPO is called an "initial" offering.

Tesla has various options for raising cash including selling stock or bonds. In the case of stock, a secondary offering would come at a price relative to the current stock price. In the case of bonds, bonds are in almost all cases higher in the capital structure than equity. Having a large "equity cushion" makes bonds more attractive because there is someone else that will take losses before the bondholders.