Most likely, the gearbox ended it's cycle with the piston cocked, and the battery simply doesn't deliver enough power to get the motor to turn it over.
Try taking just one shot in semi with a 7.4v or 11.1v lipo.
If the gearbox really IS jammed, it'll still make that "tick" sound, which indicates there's an issue (but a single trigger pull won't break anything on an 11.1v lipo). If it frees up, it means you need a better battery.
Glass fuses don't necessarily trip instantly. They heat up then fail. If it glows like that, it means there's a dead short (if your motor won't turn, or simply doesn't have enough power to turn, it becomes a dead short), and your battery simply doesn't have enough power to burn the fuse out instantly. You don't get very much amperage from those small NiMH batteries.
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