Am I missing something about neuro-stun? Options

[fazzamar]

So I'm GMing and while doing a run my runners come across a flying drone with a grenade launcher w/ an airburst link and a few Neuro-Stun grenades. While the runners are distracted by the guards the drone fires a neuro-stun grenade at one of the runners, it hits, I roll scatter, and since the launcher has an airburst link I tell them that they hear a hissing from the grenade right when it stops (Neuro-stun is odorless and colorless). The whole team is within the 10m and a couple through on gas masks when their turn comes up, but by then it's too late right? So at the end of the next combat turn I have them roll body to resist the 10 stun (no chemical resistance in the group). 2 of them promptly drop, the other 3 are 1 or 2 boxes from unconscious, which is say the least is serious trouble since -3 dice pool mod from stun and -2 dice pool mod from disoriented means their pretty much screwed. It just seems that neuro-stun grenades + airburst link = a little overpowered.