question about the pseudo code in Algorithm 1

[yananchen1989]

hi author, the line 13 is correct ? if a is answer action, i suppose it should not return but rather continue to render action for next step, right ?

another question of mine is that does this benchmark support expansion ? I mean can I add objects or change the layout of the object within the scene. I see in the paper, you mentioned runtime scene editor in appendix 6.3 scene editing.
may I know how to use this runtime scene editor ?

thanks.