VPR Reawakening cause?

Hello,

I've noticed a few times now that I can reawaken at points I wasn't expecting to.
Usually it's when my Serpent Offering gauge is empty, and it's allowed me to chain two Reawakenings back to back from a gauge of 50.

The image below shows Reawakening is selectable and I THINK this happened after I used Uncoiled Fury.

https://i.ibb.co/YTfw330/Screenshot-...-01-192703.png

Any advice for what am I missing here?
Or am I misunderstanding the trigger for this.

I'm currently lvl92.

Thanks!

Oh, nevermind, found out why!

I didn't realise Serpent's Ire had been upgraded which gives you the option to trigger Reawaken.

Serpent's Ire: Grants Ready to Reawaken