What coldplay concert got to do with your knee injury?

This is the 6 million dollar question that FATA had to answer last week.

after training arduously for Osim tri, surviving it without injury...
his knee gave in finally and it is not from running downhill, biking up Mt Faber the don't know how many times times or kicking off sharks or jelly fish in the sea
BUT

from standing and jumping during the 2 hours Coldplay one night only concert in Singapore.

and this injury lasted more than 2 weeks.
well could have recovered earlier if you don't bike and walk too much after but..
how can going to a concert give me knee problem!

just a reminder anything that resemble the activity can aggravate even if it is just going to a concert. Unless it is a classic music concert where everyone is expected only to stand for ovation at the end...