Violation or Absolutely Nothing???

[djskinn]

Timeout by Team A. First horn, followed by second horn. Team A still huddled at bench. Official whistles, still no movement from Team A. Puts ball down and begins slowly counting 5 seconds. Count is on three when B1 runs to the ball (stepping out of bounds), coach for Team B yells to not touch and get back on the court (player never touches the ball). Official is on 4 with the count when Team A finally gets to the ball. A1 is unable to throw-in the ball and official whistles a 5 second violation (actually more like 7 or 8 seconds realistically at this point).

Team A coach argues a violation was committed when B1 stepped out of bounds since it was a live ball. Any validity to the argument?