Not sure where you were hunting elephant. Where both these elephant the target ones you where hunting or just elephant that decided to charge?
The first was one of two bulls feeding in heavy vegetation on an "island" in the Caprivi. This was a Community animal and we had been made aware of their presence by the locals. They took us to the island in a couple makoros (native term for piece of wood that barely floats) and led us right up to them - unfortunately, all we could see was two big elephant butts. The vegetation was really thick and there was a line of trees between them and us with not much room to the water's edge.
We were downwind and they were making a tremendous amount of noise feeding. The PH suggested we move around to the side to get a better look and possibly an opportunity for a side brain shot.
As we passed abeam them, concealed by the trees and vegetation, for whatever reason - the one closest to us swung 90 degrees and passed deep enough into the trees to either smell, hear, or see us - and next I knew, this big elephant head appeared to float out of the trees with his trunk up sniffing and his ears out. The grass was about 6' high so all I could see was head.
As if in slow motion, I could see the tip of his trunk turn towards me, his right eye focus on me, and I knew what he was thinking - I could see his eyelashes.
What happened next was one motion. I brought my rifle up, the elephant's ears snapped back - so hard I could hear the slap, his head lowered, and he lunged forward. I heard the PH say, "Take him" as I squeezed the trigger. As I watched him drop I saw the other bull emerge from the trees - the PH was on him so I stayed with the first one. I put a second shot into the heart.
The second one was in Zim. The trackers had been on a group of 5 bulls for several hours, and when the bulls stopped to feed, they came and got us. The wind had been rather unsteady for a few days - we got close to several bulls in the days prior, but they winded us and fled.
Because of that, we took our time and passed well around them to close in from in front of them - mostly. They were in a heavy stand of trees and thick brush - feeding in different directions.
We could tell there was one bull taller than the rest but couldn't see any of their tusks. The trackers knew there was one really old bull - but again, it was difficult to pick him out.
The thick brush made it as tough to move as it was to see, and the wind swirling around didn't help.
The PH and I were separated by about 20 yds, he had advanced off to my right to get a better look.
When he determined the tall one was the old bull we were after, he motioned me to find a clear shot and take it.
They were all heads down feeding with the big guy behind a stand of trees - in front of me.
The wind was steady and I eased cautiously through the brush to get to a position where I could get a shot.
It had to be the wind, next thing I know - his head came up, he smashed the tree, and started forward. I took my first shot which hit just off-center. He rocked his head back, turned slightly to his right and I hit him in the shoulder.
The PH fired on my second shot and again as the elephant spun around and continued forward - stunned.
The other elephants were advancing as well and fortunately went around us.
I have tracked elephants through brush so thick I had to crawl and yet, they leave absolutely no trace of having passed. Well that day was not the case. The wounded elephant was smashing everything in his way and the others were wasting no time clearing a path. Trees, brush, and elephants everywhere.
The PH shot again and the elephant stumbled to the ground, I got off another shot as it fell and followed up with a shot to the heart.
We had 8 charges on that hunt. Mostly from elephants on the road, but several just appearing seemingly out of nowhere in the brush. One - female, came at us from over 100 yds away. We got the vehicle turned around and the Game Scout fired over her head - she was maybe 20' as we pulled away.