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Ladybird chalange

Why on earth would a Ladybird take on a Wasp for a sip of sap from a scratch on a Hogweed stem?
http://www.ispot.org.uk/node/216984
It put in quite a bit of effort in order to get the sap of a damaged plant within a few feet of clean water and was clamping down whenever the wasps touched it and did not stop feeding on the sap until it had satisfied its need. It moved to another location on the plant and the wasps lost interest in an instant.
What is going on here?

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