just figured id drop my tip in here:
If you're kinda close to someone and you want to throw explosives at them - dont. Instead run up at them, drop the explosive (costs 2 TU and no energy) then run away behind them or otherwise out of their view and get to cover. Use of sprinting is encouraged. This wont get the explosive in the same tile as them, but it will basically do the job (I think it hits under armor if they're even adjacent to it). If your grenades and explosives are pre-primed like they should be... you could even drop 2 grenades right beside them, especially worthwhile for chem, incendiary, and stun grenades.
(tends to be very useful in reticulan ships too, rather than engage in melee or gunfire you just run through dropping grenades as you go, or releasing a firebomb on each floor)
This idea came up about base defense recently and its one way you can employ barrel bombing in a hangar. Lots of energy and TUs and provokes reaction fire to throw it, and it will not travel. So just come off the catwalk with a full TU meter, drop it on the ground, then run into the next room and around the corner. High reactions enemies might get a shot off but the barrel will already be in the room with them, also you're more likely to be shot running away than entering the room if you started with full TUs (I guess that can be a serious thing if the dude is using a plasma scorcher).
Multiple hands can do this with lesser explosives to take out the lokknarr barn too. Two hands with satchel charges, maybe 4 hands with High-Ex. You just get them in position, wait until the next turn - then everybody drops it and runs. No need for the barrel bomb necessarily and it will give those hands something to do rather than reaction fire on the farmer.