"16.11 At 13:00, a radio telegram arrives from the XXXXVI Tank Corps giving us the objective to deliver an attack from Shitkovo through Lama, as the progress of 2 Pz.D. is blocked by flanking fire from the forest east of Morozovo."
NARA T-315 R-587 F-1014/1019
The Soviet report shines a little more light on the nature of this blocking fire:
"On 16.11, around 12:00, the enemy began an attack on the left flank of the 316th Rifle Division (8th Guards) with 25 tanks. Of them, 7 tanks fired from standstill and 18 drove towards Morozovo. The 4th AT gun battery of the 768th Artillery Regiment opened fire on the advancing tanks despite enemy fire. As a result, 3 tanks were knocked out and the tank attack was pushed back. The battery lost one gun."
Seems like a fairly standard course of events, but the 768th Artillery Regiment wasn't an ordinary AT gun unit.
This is a map of the 768th and 296th Artillery Regiments from just a few days prior. The 768th is armed with a rather curious array of weapons: 37 mm AA autocannons and 85 mm AA guns. Seems that they were quite effective in an AT role, just like the German 88 mm AA gun.
This is hardly the only effective use of 85 mm guns. For example, a month prior at Ilyinskoye line of defense at Maloyaroslavets, an 85 mm gun battery destroyed 14 German tanks and 10 trucks or APCs in only 10 minutes.