Were it me, I would have retreated to the aforementioned cover and taken a potshot at Rhodes. Ah well, too late now. Let the dice fall as they may.
On the subject of Firebombs:
I was thinking about it at work, and AP6 probably is a bit much. On the other hand, I don't think AP0 makes sense for them either. Because, you know, fire. Hand Flamer has AP2, Flamer has AP3. Might be best to just downgrade the AP to one of those numbers, if it comes to houseruling it.
On the subject of shooty things at hand:
The gangers are suspended from the ceiling, right? ~8m up, or so? What's holding them there, and how possible would it be to shoot through it?