Leon is up to all those sly tricks.

He gets ideas like that out of the stories he's so fond of soaking in." "Keep still now, Thad, and we'll creep closer," warned the other.
They really had their hands full endeavoring to advance upon the prowler without making any sort of sound that would arouse his suspicions.

Hugh realized that if anything of this sort occurred the other would instantly throw the full glow of his little electric torch in their direction, and, of course, immediately discover their presence.
If such a thing happened it might interfere with their suddenly arranged plan of campaign, and prevent the capture they contemplated, which would be a grievous disappointment to both boys.
The unknown party had come to a standstill.

He stood there in front of the long row of new lockers in which the boys who meant to take part in the principal events of the great athletic tournament kept their possessions, without which they would be more or less handicapped in their practice work.
Thad had made another important discovery; indeed, it struck him as so significant that he could not forbear dragging Hugh down so that he could place his lips against the other's ear and whisper: "It's _your_ locker he's trying to open, Hugh, don't you see ?" Hugh, of course, had already noted this circumstance, and felt duly thrilled, for really it struck him as something more than an accident, and along the lines of a deep design.

Doubtless, his active brain started to wrestle with the problem as to why any one should wish to open his locker, since the only things he kept there consisted of his running jersey and trunks and shoes.
Could it be possible that this was only some small piece of spite-work engineered by his old and inveterate enemy, Nick Lang, and ordered carried out by one of the bully's cronies; while Nick himself made certain to be in good company, so he could easily prove an alibi if accused of the mean trick.
It seemed almost too contemptible to be true, since Hugh could easily purchase other garments down at the sporting-goods store in Scranton.
Still, some mean natures are small enough to love to give "stabs" that might annoy the recipient; and boys sometimes grow so accustomed to certain articles of wearing apparel that being compelled to "break in" a new pair of running shoes might lose Hugh the great race! He gritted his teeth as a wave of indignation swept over him.