There's a double space between "of" and "unfriendly" in OVER-FALLS-STR:
<PSETG OVER-FALLS-STR
"I didn't think you would REALLY try to go over the falls in a
barrel. It seems that some 450 feet below, you were met by a number
of unfriendly rocks and boulders, causing your immediate demise. Is
this what 'over a barrel' means?">
There's a double space between "of" and "unfriendly" in
OVER-FALLS-STR
: