A jungle cat is a stealthy, dangerous predator, so the person's stride being like a jungle cat means that it is sure and unhurried, as opposed to clumsy or hurried.
Context: He stepped lightly, his stride sure and unhurried
Hypothesis: He stepped lightly, his stride like a huge jungle cat , an apex predator out for a prowl in his domain.

Is the hypothesis incorrect? (Yes, no, or unknown)?