Breaking chain locks using a Halligan bar - GIF

[desbromilow]

Fireys wear gloves, and I always have a loose grip on things like that when they're being struck. The holder of the Halligan bar only needs to stop it twisting against the chain, not supply any downward or upward force.
The training videos (and promotional videos) for forced entry are actually quite interesting, and I've learned a lot from reverse engineering the tools and methods they showcase.