Since it’s a rule that doesn’t exist during non-bonus spins, I think the clearer the host makes this bonus spin rule, the better.
There might have been a case very early on when the bonus spin was first introduced, where a contestant tried to finesse the spin, came up short, and was surprised when they learned they don’t get a second whack. Afterwards, Bob would have been instructed to make the rule perfectly clear. Who knows? Of course, we’d have to find the very first episode when the bonus spin was introduced to see if Bob always explained it that way.
Using certain negative language as “you can’t” , “if you don’t”, etc is fine, especially as such types of negatives are used in the game play descriptions of countless pricing games. Bob explained it in a firm, cautionary, and more formal manner.
We might all be on the verge of splitting hairs here. Ha