whenever an object collide that actually means its overlapping another object.
General collision algorithms generates an area becouse of this, not a point. So you cannot get a point of collision happened.
(i may be wrong on this issue not expert enough on construct 2)
You may be find "overlapping at offset" useful on this issue. sou you can dedect from which side does it hits by using x,y coordinates in an object itself and manipulate the angle according to the side
also this thread may help you too: