Public restroom - End of the roll etiquette

So I went #2 in a restaurant bathroom. One urinal, one stall. I use the end of the roll of tp. It’s in one of those dispensers where you wouldn’t necessarily know it it was empty before hand. Looked around on the way out, no extra roll anywhere and to make matters worse, the paper towel dispenser is one of those “wave your hand in just the right place” kinds that only spits out 6” of paper. I did tear off one paper towel and put it over the handrail in the bathroom on my way out but somebody is gonna have a bad time if they don’t check before.

Tell the staff outside you just dropped a growler and used all the TP or just hope for the best for the next guy?