Lindsay is a fairly cautious predator. A lot of prey protect themselves by moving in large groups, and since Lindsay isn't the biggest, strongest pred out there (though she's still a lot bigger than most mice), that's a pretty effective defense against her. She tends to bide her time, waiting for the appropriate moment to single out stragglers, waiting to strike until she knows that her prey is alone and helpless.
However, Lindsay also isn't perfect. Sometimes she misinterprets a situation, which can make for awkward moments like this.