Thanks to @anastasia_snape, and “dannyradcliffe06uk,” we’ve found this great video of Tom Felton as “James” in the 1998 episode of the TV series, “Bugs.” In this episode, called “Pandora’s Box,” he plays the boy who finds an “infected sword.” More screencaps here.
As a side note, to explain why there was an infected sword, here is the episode summary:
A scholar seeks to prove his theory that a toxic waste dump was constructed over the tomb of King Arthur. In his haste to unearth the site, he releases a deadly bacterial plague that starts to kill again.
Ah, that makes perfect sense!