Why Narvik's close fighting favoured guns over British torpedoes

What about the Tribal-class destroyers' torpedo hits at Narvik?

The fighting was described as so close that British ships often preferred guns because their torpedoes might not arm before impact.

Narvik is raised as an alternative source of high British destroyer torpedo tallies. The explanation offered is that much of the fighting took place at very close range, where a torpedo might reach its target before arming. British destroyers are therefore described as relying heavily on their guns. German destroyers sometimes gained enough separation to launch torpedoes, illustrating why the distance between ships affected which weapons were useful.