While pushing the spider body towards the spike pit, it's possible to climb it as it makes it's final roll into the pit. Depending on when Limboy climbs the body, the boost can, at best, clear you over the ledge and save the climbing animation. At worst, it can fling you directly into the spike pit. For the most part, though, the strategy is not overtly risky.
Saves 0.5-1.5 seconds.