No solid proof on this, but I think it has to do with the ExtraPositionInfo that can be requested from the person such as energy, item and weapon status, and S2C Weapon latency. The stuff you see when staff spectates on a person flying around in gray text at the top-center portion of the screen. EDIT: After further review, the ruling on the field stands. SOS appears to have the correct answer. I direct your attention to the definitions for S2C Packets 0x05 0x28 (Coincidentally also written by SOS). It even addresses the problem in 0x28: 0x05 Large Position Packet (Weapons Packet)
Offset Length Description
0 1 Type Byte 0x05
1 1 Direction (0 ... 360)
2 2 Time Stamp
4 2 X Pixels (0 ... 16384)
6 2 Y Velocity
8 2 Player ID
10 2 X Velocity
12 1 Checksum
13 1 Togglables *1
14 1 Ping
15 2 Y Pixels (0 ... 16384)
17 2 Bounty
19 1 Weapon Parameters
20 1 Weapon Type
21 2 Energy *2 *3 (Optional)
23 2 S2C Lag *2 (Optional)
25 2 Timer *2 (Optional)
27 4 Item Info *2 (Optional)
*1 - Bit flags for the Togglables byte in bit order.
Stealth : 1;
Cloaked : 2;
XRadar : 4; // XRadar calcs are done client-side
Antiwarp : 8; // Ditto
WarpFlash : 16; // Uncloaking, portaling, etc.
UNKNOWN1 : 32; // ?
UFO : 64; // *ufo - Illegal usage caught in sg9+
UNKNOWN2 : 128; // ?
*2 - This data is only sent if the ExtraPositionData flag is set to true in the zone settings.
*3 - This data is sent if either the ExtraPositionData flag is set to true, or if you are using the Energy password. 0x28 Small Position Packet
Offset Length Description
0 1 Type Byte 0x28
1 1 Direction (0 ... 360)
2 2 Timestamp
4 2 X Pixels (0 ... 16384)
6 1 Ping
7 1 Bounty
8 1 Player ID *1
9 1 Togglables *2
10 2 Y Velocity *3
12 2 Y Pixels (0 ... 16384)
14 2 X Velocity *3
16 2 Energy *4 *5 (Optional)
18 2 S2C Lag *4 (Optional)
20 2 Timers *4 (Optional)
22 4 Items *4 *6 (Optional)
*1 - Since the Player ID here is only one byte, this packet is only capable of addressing the first 256 clients in a zone.
*2 - Togglables:
Each value is one bit in a byte
Bit 1 - Stealth
Bit 2 - Cloak
Bit 4 - XRadar
Bit 8 - Antiwarp
Bit 16 - Flash (Play the cloak/warp flash)
Bit 32 - Safety (In safe)
Bit 64 - UFO (Using UFO)
Bit 128 - ?
*3 - Velocities are measured in Pixels per 10 Seconds.
*4 - These values are only received if the ExtraPositionData variable in the Settings is set to True.
*5 - This value is sent if either the ExtraPositionData value is set to True in the settings or if you are using the Energy password.
*6 - Item Info
Unsigned Integer Values or Booleans
Shields (Boolean) :1 bit
Super (Boolean) :1 bit
Burst Count :4 bits
Repel Count :4 bits
Thor Count :4 bits
Brick Count :4 bits
Decoy Count :4 bits
Rocket Count :4 bits
Portal Count :4 bits
? Unknown :2 bits Source: http://d1st0rt.sscentral.com/packets.html