Scatological drivel

What was the problem? Scatology.
"Well, well, well." Said the old man, "You need to concentrate more,
don't you?"
"I do concentrate." Answered the 12 year old boy, staring intensely
into his mentors watery blue eyes.
"Do you now. Then can you do this?" The old man screwed up his wrinkled
old face&;#8230;and nothing happened, then he began to turn a
scarlet colour, he surely was concentrating. Then the sound rang out
triumphantly, like no other fart the boy had ever heard, it resonated
unequivocally in the air. "Arrrr" sighed the old man. Then it hit the
boy the pungent aroma of gas trapped in caustic conditions around
excrement being released into the breathable air of the room they were
in.
"Now that's concentration" said the old man, "unfortunately though, I
think I have put one in my own net, please excuse me."
"No problem" answered the 12 year old grinning.