I hear that!!
If you let him in the grass, make sure you have enough area to be able to cut him off and grab him.
This fella gave me a bit of an elevated heart rate last summer. Retics are the fastest snake (boa/python) I've ever worked with I don't think I'd ever lay certain colubrid types in the grass.
See the deck in the background? If he made it under, I'd have been in a real jam.
If you can get you Bredli on a deck rail or some type of ladder or prop, you'll be less stressed.
Your guy will look great outside!