I do something that may sound truly strange, but it works for me.
Imagine what "hey!" sounds like...without the "h" sound. It's not especially loud in volume, but high up in the back of my throat, quick, sharp and positively ear-piercing. Not at all like yelling. It's instinctive on my part and it has caused every dog I've ever had to immediately stop whatever they're doing...and, um, shall we say, reconsider.
This sound clearly horrifies them and causes an instantaneous "STOP" reaction.
Obviously, it's not what I say...it's the sound I make. And since it really is my automatic response to all bad (or dangerous to them) behavior, there's no delay between their action and my
reaction. Perhaps you can find something like that within yourself that will be equally effective for you and your little Bentley.