poor attempt at humor; this is way up north. those waters are icy, a swimmer in May would die of hypothermia very quickly. and the lake large; in darkness, how could one tell which way to swim? He did what was wise, and is alive to tell the tale.
If the two "boys" were seven, big deal. If they were 17, they are as guilty as adults for refusal to help or send help...
Off topic here, but I wonder what time it was at night when the two boys were talking past the biker and ignored him...