My traxxas slash doesn't drive ?

I got it 2 days ago for my birthday but it was used so I'm not sure how old it was anyway I have been driving it regularly and the only thing of note was i tightened the slipper clutch good and went over a jump but didn't see the mud puddle behind it so my slash got dirty and wet but apparently it's waterproof so I didn't think anything of it I cleaned it though and I drove it today worked fine then it suddenly died and the steering works fine but it won't move an inch I was running A 5100 mah 8.4 volt battery and when I touched the motor it was extremely hot so I let it cool down and tried again lifting the wheels up and it spun for a second or two so I let go tried again ,nothing what happened also it won't go backwards even if I push it only forward O_O