The Lambert challenge from Forest keeper...

Was it a penalty?
It would have been a free kick if 2 midfielders came together like that in centre circle.

Looked a brace challenge to me. He had to go for it and could easily have got hurt himself

Know what you mean. I would have been amazed if it was given but was watching it on tv with a mate and he said "watch the slow motion - the keepers tackle is over the top. Yes it was accidental but as I said, if it was 2 outfield players it would definitely be a FK and probably a booking.