Though it would not be wise to make a conclusion about take off simply by viewing some pictures, still we can draw some observational inferences in general.
Just before take off the GIH use their legs to fly in the air. Here the bird was confident that the branch of tree it was on was strong enough.

I noticed that like other birds the GIH never take their wings above their bodies to make upstrokes. The glide in the air to some distance spreading their legs on both sides. This is a unique characteristic of the GIH.

When they intend to cover small distances as in this case where its flight ended in a big tree in front of it, they do not use their full wings to make deep down strokes; they rather use the outer and smaller part of their wings to make smaller down strokes.

Birds fly and go away beyond our vision. What remains are the memories of the past as the branch of tree which the bird left from. Those memories of the past help us to understand and to determine what the next flight should be like, and how to come out of the jargon of science and to cherish in the mind the grandeur of the magnificence that the small moments in the nature provide us. There should not be any hurry to make a unique conclusion, nor any urge to make some unique discovers, but there should only be some confident and yellow steps to move forward in the lackluster canvas of our daily life, as yellow as the IndiaWilds.

Photographed, Written in Bengali by Samrat Sarkar.
Translation into English by Biswajit Debnath.
Equipment used - Canon EOS 7D + Canon 500mm f4 + Monopod