To the guy walking in front of me in Snowdon metro station:

I would like to inform you that when walking in a metro station during high-traffic hours, it is always good policy to KEEP WITH THE FLOW, and avoid sudden deceleration. Indeed, said deceleration is likely to unsettle certain human bodies that have elected to follow the rules of inertia, viz. that a body in movement tends to remain in movement.

I do not contest that this reckless suspension of momentum might not be entirely unjustified. However, I would like to point out that although it might be commendable to yield the right of way to the nice lady walking beside you, it would also be wise to mind the nice lady walking behind.

This time, collision was averted due to my mad ninja skills, but next time, you might not be so lucky.