This video shows roller furling of a jib in 5 knots of wind. Mild tensing is kept on the jib's sheet to enable the jib to warp tightly around the headstay. In high wind conditions, this is best done in a deep running reach. The mainsail will tend to shield the jib from the wind. This will prevent excess luffing of the sail and make furling easier. In a pinch, you can always let the jib out, by loosening it's sheet and roll in the jib, but in high winds excess luffing may occur and this can damage the sail. The roller furling line must be carefully handled in a high-wind situation, or the wind may overpower the sailor and unfurl the sail.
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