What constitutes enough construction?

What's "not enough" obstruction? Ref allows try.

Goo england!

They need myler. Best Kicking average in the premiership

COME ON ENGLAND

Replays show some blocking! Big decision to come!

Try*

No tru

Owen Farrell goes over for a try after picking a good line. Clancy goes upstairs to see if Stephen Moore is obstructed by Hartley

Farrell rises to challenge. Awesome 5 mins.