I think the last 5 trades were from 1 trader of 16500 lot. he might got in yesterday and waiting for today ann, which it didn't come. So he had to sold in to any buyers available to avoid settlement.
Price Volume Time
56.5 5095.0 155743
57.0 4390.0 155743
57.5 4320.0 155743
57.5 1000.0 155743
58.0 1695.0 155743