There are quite a lot of the mines. They're placed relatively close together, so that if someone survives the explosion of one, the next one'll be set off, and so on and so forth. The Combine are efficient that way.
They're also set to leap into the air and detonate somewhere between one and two meters above the surface if proximity or concussion sets them off.
We're not sure what someone from England would consider appropriate music for what happens next, but any American who'd ever watched more than one or two fireworks displays would consider the ensuing demonstration of hopping and exploding and shattering in all directions to be well worth the final movement of the 1812 Overture.
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They're also set to leap into the air and detonate somewhere between one and two meters above the surface if proximity or concussion sets them off.
We're not sure what someone from England would consider appropriate music for what happens next, but any American who'd ever watched more than one or two fireworks displays would consider the ensuing demonstration of hopping and exploding and shattering in all directions to be well worth the final movement of the 1812 Overture.