HPI Baja 5T boat, Spektrum radio + without a kill switch = Baja Boat

So i just bought this Baja 5t stock off ebay with a GBE pipe. Picked it up from Fed ex 10/30/2015. so i drove it that Saturday with no problems after tweaking it a bit. the on off switch was suspect and i thought i turned it off but apparently it wasn't off completely. i had enough juice to get the truck out there do two passes even flip over before the video started. i gave it full throttle in one direction and it stayed that way. the failsafe was set i did turn the controller off as it was driving away bu