Used by the routines at Handle_Sabreman_On_Rope, Handle_Sabreman_Walking, Handle_Sabreman_Jumping, Handle_Sabreman_Falling, Handle_Sabreman_Tumbling, Handle_Flying_Creature and Handle_Carrying_Eagle.

Checks whether an object is touching one of the four bubbles (the object records that start at First_Bubble_Record and have the type 88 to 91).

No bubble is touched if bit 4 or bit 5 of the countdown in byte 10 is set. This is the case for Sabreman for a while after he has started to fall, and it lets him get away from a bubble.

An object touches a bubble when the two are in the same room, the x positions differ by less than 13 and the y position of the object is between zero and 14 pixels above the y position of the bubble.

When there is contact the result in C has bit 2 and bit 1 set (a bubble is always taken as being under the object). Bit 7 is set if the object is to the right of the bubble. Bits 5 and 0 are set if the x positions differ by 10 or more, which means that the object is not near the middle of the bubble. Otherwise the y position of the object is set to 14 less than that of the bubble so that it stands on it, and bit 4 of E and bit 4 of the contact flags (byte 11) are set.

If the object is Sabreman (the type is between 9 and 27) and he is touching a bubble while he is near the top of the room (the y position is less than 72) then the bubble pushes him up. In a room with a ceiling he starts tumbling (see Start_Tumbling_Downwards), which draws him and ends the handler that called this routine. In a room with no ceiling he moves into the room above, if his y position is less than 44. The y position then becomes 175 the first bubble record becomes a copy of the record of Sabreman as a bubble (88) at the y position 184 and the new room is drawn.