Place it under the walking shot itself, then follow the exit with goofy ahh sounds for the reaction beat. If the character suddenly bolts, switch to the run vine sound effect for the chase instead of stretching this one.
About this sound
This is a short run of squeaky, rubbery footsteps linked to SpongeBob, with a quick bouncy patter that lasts a few seconds. It feels goofy and sheepish, turning a plain exit into something awkwardly dramatic. The footsteps come from SpongeBob SquarePants, the animated series built around its title character.