Yeah I feel bad for you!
I've seen a couple of people that actually threw their phones, one into pavement and hardly a scratch.
BUT, with just the right point of impact, even what should be fine, I've seen people who had the screen crack.
If you have insurance from your Carrier, credit card or something, you may be in luck 🤞🏻
One of my hobbies for the last several decades has been stained glass and it's highly unlikely that no matter how many blades of grass were there upon impact.
Either the phone had already been damaged before you got it or the Otter case may have contributed to the damage.
Look very closely.