NCAA and NF differences.
 

In reply to your initial question: Under NF rules the holder can catch the snap with a knee on the ground and rise to run, pass, etc. This rule is the same for a field goal and a try. Sounds like there was an inadvertent whistle in your situation. (The penalty for an early whistle in our association is a case of the crew's favorite fermented beverage).

I know that in NCAA rules the holder can have a knee on the ground, catch the snap, and pass it to a teammate without rising off the ground.

Under NCAA can the holder do this for a field goal and also on the try?

More on NF extra points and field goals.
 

Just wanted to add these play situations that were discussed at last night's meeting:

Field goal is blocked behind the line, either K or R can recover in or behind the line and advance. (NF and NCAA).

Try kick is blocked behind the line, the play is dead when it is apparent the kick will not score(watch for tipped kicks that continue in flight towards the goal posts). (NF only). I believe that under NCAA rules the ball remains live. Can somebody help me out on this?

Yes. Under NCAA rules, the blocked kick can be returned by the defense for 2 points.