If the battery died while trying to remote start, there are various reasons why it could be still hooked to the starter. If this is the case it will closely resemble a short. Compared to the rest of the car the starter resembles a short. Calculate the resistance of a 12v circuit handling 250amps and you will see that the resistance calculated (V = IR, voltage equals current times resistance, so R = V/I) is close enough to zero to seem like a short to a weak battery.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician