The incident has come as the Environment Agency and Met Office warn of a higher risk of flooding this autumn and winter, even after only brief periods of rain, because of the wet summer that Wales has experienced.
Rivers are full, the ground is saturated and ground waters very high in some areas, after the wettest April to June on record, and further rainfall in July, September and October.
The Environment Agency says there are 357,000 properties at risk of flooding from in Wales.
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A dry start to the night with mist and low cloud, but rain will push into the south by the early hours.
Two people forced their way into a flat in Caerphilly and demanded the victim's car keys. He was assaulted and received cuts to his head.