When slowed the OT hammer swings about once per 20 seconds. As you make 2 procs per min, aka 0.66 procs per 20 seconds, most times you will get that proc on the first swing.
When hasted you swing the OT hammer every 2.5 seconds, meaning only a 1/12 chance proc to swing. Note each individual swing is unlikely to proc, but you are hasted so you make more swings. The high sample rate means you are more likely to end up close to the expected time of 30 seconds of fighting before procing than the 1 hit wonder when you are slowed (if you don't proc on the first two swings when slowed, you're already behind on the expected procs per min).
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