As is usual for PCs, Qui-Gon can talk despite being engaged in combat, holding his breath, or being unconscious and bleeding to death.

Fortunately for the sake of realistic consequences within the story, what he says isn't particularly relevant.

Transcript

Obi-Wan: Wow. There was a lot more going on than we realised.
Obi-Wan: But how did the Trade Federation know the Gungan battle plans?
Darth Maul: There's a snitch amongst the Gungans—
Qui-Gon: Bubble! I told you that goatee was trouble!
Obi-Wan: He's not a Gungan.
Darth Maul: Nah... one of their military commanders. Captain Tarpus or something.
Obi-Wan: Tarpals! Oh my god! Jar Jar!
Darth Maul: Look, you seem like a decent kid. Shame I had to off your hot-headed partner, but he wasn't listening to reason.
Qui-Gon: {in a crumpled heap in the background} I'm right here, you know. Me and my -8 hit points.
GM: <roll> -9.
Qui-Gon: I'll be quiet.