I always imagined tripmines as something for the Sniper's secondary grenade. He'd lay them across doorways. Enemy players could deactivate them, possibly by shooting them or standing next to them for a second or two, but that would leave them vulnerable for the time it took, and they'd also lose all their momentum from concs and bhopping. The explosion would do less damage than a regular grenade, and the tripmine would disintegrate after a fairly short period of time.
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