Bonds of Force is a pretty short ranged spell. It's hard to tell how far away you are from that screen shot, but it looks to me that you are out of range.
If you imagine the models as being mounted on a base, remember ranges are drawn from the centre of the base to centre of the base, so just because you are close to the head of a large model your feet/base won't necessarily be close enough to the feet/base of the other model to be in range to cast a spell.
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