Walking into a cauldron

Morne Morkel to Sreesanth, out Caught by Steyn!! Another one falls! Steyn was the only fielder on the off side, close in, to where a short mid off would be, full and in the slot for the drive, Sreesanth just thumped it straight down the fielder's lap. Soft dismissal that, though Sreesanth hit it well. Enter Jaidev Unadkat on debut! One has to feel sorry for the young man, walking in to a cauldron against a rampant SA attack

Please explain to me what cauldron means here.

This paragraph is a commentary part of cricket.

Source : cricbuzz