Squad Leader Days: POGs wanted to insert ground sensors at the most IED-laden sites, to identify when & where the Taliban are inserting these IED's. Took a wide loop from Outpost "Man-Bear-Pig" & pushed north. Took some fire & radio'd a "situation report" to higher. Taliban was trying to lead us into a firefight by shooting at us, indiscriminately. However, orders from the Command Post was to break contact & continue with the mission. Higher was right, and the focus was inserting the ground sensors. We broke contact systematically, team by team, utilizing bounding over-watch. In doing so, Slim hit an IED. He always ran point for his team, always leading from the front. Out of the corner of my eye, an explosion happens & Slim flew straight up about 10 ft, and fell back down. 2 legs missing & he yelled, "FUCK!" That's all he kept saying... I told the squad to get outboard security & don't FUCKING move. I called for the engineer to sweep & clear a path towards Slim cause he was hurting, badly. At the same time, I'm sending up the casualty evac transmission. Before the engineer can clear a path, @ralph_ak starts sprinting towards Slim. I start yelling from my position, "Don't fucking move 1 more step! It's not clear!" He kept going & ran through the uncleared path. I told the engineer to keep sweeping anyway. 2 Afghanis sped off on a motorcycle. In my heart, I knew it was the Taliban observing us, as they always do. My M-Gunner radio'd to me & asked if he can shoot the fleeing suspects. As much as I wanted to, I said no. We were in a dense area & I didn't want any civilians getting hit by possible stray rounds. The same path that @ralph_ak ran through, the engineer found a secondary IED. A common Taliban practice is to set multiple IEDs to set off a chain of explosions. Once the path was cleared, I ran to Slim's position. He was ghostly white & slipping in & out of consciousness. I wanted him to live but I knew he was gonna die... Both legs were blown off above the knee cap. The U.K. Air force came screaming in with their Chinook & took off. We found out later Slim didn't make it. I wish I can relive this day & correct mistakes.