The hidden blade is used for stealth kills. There's not a whole lot of depth to the combat system in Bloodlines, but Altair has access to four types of weapons: a long sword, throwing daggers (that can also be used in close combat), a hidden blade, and his fists. Blending also allows him to get closer to his enemies for a very devastating stealth kill. Blending is actually quite useful and keeps guards out of Altair's hair. In order to keep a low profile, either jog or blend. The last one usually incites the offended soldier to engage Altair. Some high profile moves include sprinting, grabbing, and bumping into soldiers. This means you are being closely monitored and cautions you to keep a lower profile before the warning erupts into a full-fledged conflict. Whenever something catches a guard's attention, such as sprinting or other out-of-the-ordinary behavior, an eye appears over the icon and emits a beeping noise. The icon in the upper left corner reflects Altair's degree of anonymity to his enemies. This, then, could arouse suspicion of guards nearby. However, that can be difficult when people near you mysteriously keel over and die without a known cause. Part of being an expert assassin is keeping a low profile. Once the coast is clear, the dramatic music dies out and the icon reverts to its usual, white color of anonymity. Of course, you would need to hide without the guards seeing. In order to alleviate the alarm levels, you either need to kill all the soldiers in sight, or quickly run away and hide either in a haystack or in the little curtain structures. Any wandering soldiers in line of sight will also join the fight. A red color denotes more dire circumstances, in which the soldiers are pushed into combat. When it turns yellow, it means they are on the prowl for Altair. As mentioned above, the icon to the upper left basically indicates the soldier's awareness levels.

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