Are you talking about something like this? http://youtu.be/QCCgQONvdSY
SKhud has this in the hud animations text
HudAnimations_tf.txt wrote:
event DamagedPlayer
{
//======================================
// UNCOMMENT CROSSHAIR WHAT YOU WANT
//======================================
//==============================DAMAGE COLOUR DOT==================================
//Animate xHairCrossDMGCLR FgColor "255 0 0 255" Linear 0.0 0.00001
//Animate xHairCrossDMGCLR FgColor "255 255 255 255" Linear 0.15 0.1
//==========================DAMAGE COLOUR CROSS====================================
//Animate xHairDotDMGCLR FgColor "255 0 0 255" Linear 0.0 0.00001
//Animate xHairDotDMGCLR FgColor "255 255 255 255" Linear 0.15 0.1
//==================YOUR + CROSSHAIR W/ OUTLINE AND DAMAGE COLOUR==================
//Animate xHairDefaultDamage Alpha "255" Linear 0.0 0.00001
//Animate xHairDefaultDamage Alpha "0" Linear 0.15 0.1
//================================CoD LIKE CROSSHAIR===============================
//Animate††††xHairSlashLT FgColor "20 255 20 255"†††† Linear 0.0 0.00001
//Animate††††xHairSlashLT FgColor "0 0 0 0"†††††††† Linear 0.15 0.1
//Animate††††xHairSlashLB FgColor "20 255 20 255"†††† Linear 0.0 0.00001
//Animate††††xHairSlashLB FgColor "0 0 0 0"†††††††† Linear 0.15 0.1
//Animate††††xHairSlashRT FgColor "20 255 20 255"†††† Linear 0.0 0.00001
//Animate††††xHairSlashRT FgColor "0 0 0 0"†††††††† Linear 0.15 0.1
//Animate††††xHairSlashRB FgColor "20 255 20 255"†††† Linear 0.0 0.00001
//Animate††††xHairSlashRB FgColor "0 0 0 0"†††††††† Linear 0.15 0.1
The relevant crosshairs (for example, "xHairSlashRT") are in hudlayout.res