I would imagine it would be a real fine line between obstruction / wrestling or grappling if you actually held but differnent when pushing an arm into a position;
for either a reaction from him or to get it somewhere else to create your opening.
Im not sure
With amature rules ,you would think not many would care if he on his back or realing from the move, comming off of a leagal punch within the next second or so.

I have always wondered how you would go professionally also if you came over the outside of someones arm and hit him high and low at the same time, liver and temple shot, double hit simultanously moving through exploding the power in two different directions.
The move is there for the taking but only occasionally like when your stuck on the ropes and you duck and weave out ,right then, you feel his arm follow you and you go for it as he turns to you.

What say ye Ref ?