Big Game Situation

[RookieDude]

This situation is for Varsity Officials with 5 yrs. of experience or less...down to 1st yr. Middle School/Frosh. officials.

OK...you finally got the big game...packed house with playoff implications.

5 seconds left in the game with the clock running. A1 has just scored a basket and Team A is now down by only 1pt.
B1 is attempting to make a throw-in. A1 breaks the throw-in plane and, in your judgement, interferes with the thrower's effort to make a throw-in.
You blow your whistle...clock stops...it shows 2 seconds.

You remember Team A has no prior warnings for delay.

Did you just help Team A stop the clock?

What do you do now?