"You can't trample infidels when you're a tortoise. I mean, all you could do is give them a meaningful look"

This quote by Terry Pratchett is a funny means of explaining that some things are simply difficult. The audio speaker is suggesting that a turtle, being a slow-moving creature, can not trample infidels. The speaker after that goes on to suggest that the very best a turtle can do is offer the infidels a purposeful look. This is a funny means of suggesting that also if one is limited in their capabilities, they can still make an effect somehow. The quote is additionally a tip that even if we can refrain something, we can still make a distinction in our own distinct way. It is a reminder to not be prevented by our constraints, but to instead find imaginative means to make a difference.