Because you didn't. Well, at least in my experience I didn't. You press when you hear the noise but by the time Abe's actually pressing the mine it's too late.
Go and play Easy Mode (I didn't try Normal) and you'll see that the mines are working the way you think they should. Because you have to anticipate the green bleep on Hard doesn't mean it's broken - it means the way the mines worked have changed to make it more difficult.
They're definitely different. I had trouble with them in the beginning and thought they were inconsistent. But I eventually got the hang of them and after playing Easy it seems clear that they're deliberately different and Harder than AO. Probably to give us veteran players some unexpected challenge.
Seriously, go play the easier difficulties to check.
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